char sr(string a, string b,bool a_sign, bool b_sign) {
	if (a_sign == true && b_sign == false) return '<';
	else if (a_sign == false && b_sign == true) return '>';
	else if (a_sing == true && b_sign == true) {
		if (a == b) return '=';
		if (a.length() > b.length()) return '<';
		else if (a.length() < b.length())  return '>';
		else {
			for (int i = a.length(); i > 0; --i) if (tr(a[i]) > tr(b[i])) return '<'; else if (tr(a[i]) < tr(b[i])) return '>';
		}
	}
	else {
		if (a == b) return '=';
		if (a.length() > b.length()) return '>';
		else if (a.length() < b.length())  return '<';
		else {
			for (int i = a.length(); i > 0; --i) if (tr(a[i]) > tr(b[i])) return '>'; else if (tr(a[i]) < tr(b[i])) return '<';
		}
	}
}

string tr(long long n) {
	string b = "";
	for (int i = 0; i < abc.length() - 1; ++i)
		if (n == i) { b = abc[i]; return b; }
	return "ОШИБКА!";
}
long long tr(char n) {
	for (int i = 0; i < abc.length() - 1; ++i)
		if (n == abc[i]) return i;
	return 0;
}