function check_answer(pinconv) {
    //pinconv = pinconv.replace(/5/g, "");
    pinconv = pinconv.replace(/v1/g, "ǖ");
    pinconv = pinconv.replace(/v2/g, "ǘ");
    pinconv = pinconv.replace(/v3/g, "ǚ");
    pinconv = pinconv.replace(/v4/g, "ǜ");
    pinconv = pinconv.replace(/v5/g, "ü");
    pinconv = pinconv.replace(/ve1/g, "ǖe");
    pinconv = pinconv.replace(/ve2/g, "ǘe");
    pinconv = pinconv.replace(/ve3/g, "ǚe");
    pinconv = pinconv.replace(/ve4/g, "ǜe");
    pinconv = pinconv.replace(/ve5/g, "üe");
    pinconv = pinconv.replace(/vn1/g, "ǖn");
    pinconv = pinconv.replace(/vn2/g, "ǘn");
    pinconv = pinconv.replace(/vn3/g, "ǚn");
    pinconv = pinconv.replace(/vn4/g, "ǜn");
    pinconv = pinconv.replace(/vn5/g, "ün");

    pinconv = pinconv.replace(/a1/g, "ā");
    pinconv = pinconv.replace(/a2/g, "á");
    pinconv = pinconv.replace(/a3/g, "ǎ");
    pinconv = pinconv.replace(/a4/g, "à");
    pinconv = pinconv.replace(/a5/g, "a");
    pinconv = pinconv.replace(/ai1/g, "āi");
    pinconv = pinconv.replace(/ai2/g, "ái");
    pinconv = pinconv.replace(/ai3/g, "ǎi");
    pinconv = pinconv.replace(/ai4/g, "ài");
    pinconv = pinconv.replace(/ai5/g, "ai");
    pinconv = pinconv.replace(/an1/g, "ān");
    pinconv = pinconv.replace(/an2/g, "án");
    pinconv = pinconv.replace(/an3/g, "ǎn");
    pinconv = pinconv.replace(/an4/g, "àn");
    pinconv = pinconv.replace(/an5/g, "an");
    pinconv = pinconv.replace(/ao1/g, "āo");
    pinconv = pinconv.replace(/ao2/g, "áo");
    pinconv = pinconv.replace(/ao3/g, "ǎo");
    pinconv = pinconv.replace(/ao4/g, "ào");
    pinconv = pinconv.replace(/ao5/g, "ao");
    pinconv = pinconv.replace(/ang1/g, "āng");
    pinconv = pinconv.replace(/ang2/g, "áng");
    pinconv = pinconv.replace(/ang3/g, "ǎng");
    pinconv = pinconv.replace(/ang4/g, "àng");
    pinconv = pinconv.replace(/ang5/g, "ang");
    pinconv = pinconv.replace(/e1/g, "ē");
    pinconv = pinconv.replace(/e2/g, "é");
    pinconv = pinconv.replace(/e3/g, "ě");
    pinconv = pinconv.replace(/e4/g, "è");
    pinconv = pinconv.replace(/e5/g, "e");


    pinconv = pinconv.replace(/en1/g, "ēn");
    pinconv = pinconv.replace(/en2/g, "én");
    pinconv = pinconv.replace(/en3/g, "ěn");
    pinconv = pinconv.replace(/en4/g, "èn");
    pinconv = pinconv.replace(/en5/g, "en");
    pinconv = pinconv.replace(/er1/g, "ēr");
    pinconv = pinconv.replace(/er2/g, "ér");
    pinconv = pinconv.replace(/er3/g, "ěr");
    pinconv = pinconv.replace(/er4/g, "èr");
    pinconv = pinconv.replace(/er5/g, "er");
    pinconv = pinconv.replace(/eng1/g, "ēng");
    pinconv = pinconv.replace(/eng2/g, "éng");
    pinconv = pinconv.replace(/eng3/g, "ěng");
    pinconv = pinconv.replace(/eng4/g, "èng");
    pinconv = pinconv.replace(/eng5/g, "eng");
    pinconv = pinconv.replace(/ei1/g, "ēi");
    pinconv = pinconv.replace(/ei2/g, "éi");
    pinconv = pinconv.replace(/ei3/g, "ěi");
    pinconv = pinconv.replace(/ei4/g, "èi");
    pinconv = pinconv.replace(/ei5/g, "ei");

    pinconv = pinconv.replace(/i1/g, "ī");
    pinconv = pinconv.replace(/i2/g, "í");
    pinconv = pinconv.replace(/i3/g, "ǐ");
    pinconv = pinconv.replace(/i4/g, "ì");
    pinconv = pinconv.replace(/i5/g, "i");
    pinconv = pinconv.replace(/in1/g, "īn");
    pinconv = pinconv.replace(/in2/g, "ín");
    pinconv = pinconv.replace(/in3/g, "ǐn");
    pinconv = pinconv.replace(/in4/g, "ìn");
    pinconv = pinconv.replace(/in5/g, "in");
    pinconv = pinconv.replace(/ing1/g, "īng");
    pinconv = pinconv.replace(/ing2/g, "íng");
    pinconv = pinconv.replace(/ing3/g, "ǐng");
    pinconv = pinconv.replace(/ing4/g, "ìng");
    pinconv = pinconv.replace(/ing5/g, "ing");

    pinconv = pinconv.replace(/o1/g, "ō");
    pinconv = pinconv.replace(/o2/g, "ó");
    pinconv = pinconv.replace(/o3/g, "ǒ");
    pinconv = pinconv.replace(/o4/g, "ò");
    pinconv = pinconv.replace(/o5/g, "o");
    pinconv = pinconv.replace(/ou1/g, "ōu");
    pinconv = pinconv.replace(/ou2/g, "óu");
    pinconv = pinconv.replace(/ou3/g, "ǒu");
    pinconv = pinconv.replace(/ou4/g, "òu");
    pinconv = pinconv.replace(/ou5/g, "ou");
    pinconv = pinconv.replace(/ong1/g, "ōng");
    pinconv = pinconv.replace(/ong2/g, "óng");
    pinconv = pinconv.replace(/ong3/g, "ǒng");
    pinconv = pinconv.replace(/ong4/g, "òng");
    pinconv = pinconv.replace(/ong5/g, "ong");

    pinconv = pinconv.replace(/u1/g, "ū");
    pinconv = pinconv.replace(/u2/g, "ú");
    pinconv = pinconv.replace(/u3/g, "ǔ");
    pinconv = pinconv.replace(/u4/g, "ù");
    pinconv = pinconv.replace(/u5/g, "u");
    pinconv = pinconv.replace(/ue1/g, "ūe");
    pinconv = pinconv.replace(/ue2/g, "úe");
    pinconv = pinconv.replace(/ue3/g, "ǔe");
    pinconv = pinconv.replace(/ue4/g, "ùe");
    pinconv = pinconv.replace(/ue5/g, "ue");
    pinconv = pinconv.replace(/ui1/g, "ūi");
    pinconv = pinconv.replace(/ui2/g, "úi");
    pinconv = pinconv.replace(/ui3/g, "ǔi");
    pinconv = pinconv.replace(/ui4/g, "ùi");
    pinconv = pinconv.replace(/ui5/g, "uie");
    pinconv = pinconv.replace(/un1/g, "ūn");
    pinconv = pinconv.replace(/un2/g, "ún");
    pinconv = pinconv.replace(/un3/g, "ǔn");
    pinconv = pinconv.replace(/un4/g, "ùn");
    pinconv = pinconv.replace(/un5/g, "un");

    return pinconv;
}