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std::string getCode(const std::string &nick, int exp) {
    std::stringstream code;
    //
    size_t sz = nick.size();
    int SB = ((sz * exp) % (exp + 1)) + 1;
    int sum1 = 1;
    int sum2 = 1;
    std::string lw = toLower(nick);
    for(size_t i = 0; i < sz; i++) {
        char cur = lw[i];
        if(cur == 'a' || cur == 'e' || cur == 'g') {
            sum1 += 2;
            sum2 = (sum2 + 1) * sum1;
        } else if(cur == 'm' || cur == 'n' || cur == 'l') {
            sum1 = (sum1 + 1) * 3 - 1;
            sum2 = sum2 + sum1;
        } else if(cur == '1' || cur == '7' || cur == '9') {
            sum1 = sum1 + sum2;
            sum2 = sum2 + 4;
        }
    }
    int res = ((exp + sum1) * (SB - sum2)) % (8999) + 1000;

    code << res << exp;
    return code.str();
}