#include <iostream>
#include <string>
#include <cmath>
#include <cctype>

#define asdigit(c) (c - '0')
#define LOG(x) cout << #x << "=" << (x) << endl;

using namespace std;

string analyze_pid(string word);

int main(int argc, char **argv) {
	string word;
	while (true) {
		getline(cin, word);
		if (word == "end") break;
		cout << analyze_pid(word) << endl;
	}
	return 0;
}

string analyze_pid(string word) {
	const char *cword = word.c_str();

	// check chars
	if (word.length() < 10 || word.length() > 11 || cword[6] != '/')
		return "invalid";
	bool since1954 = word.length() == 11;
	for (int i = 0; i < word.length(); i++)
		if (i != 6 && !isdigit(cword[i]))
			return "invalid";

	// calc numbers
	int yy = asdigit(cword[0]) * 10 + asdigit(cword[1]);
	int mm = asdigit(cword[2]) * 10 + asdigit(cword[3]);
	int dd = asdigit(cword[4]) * 10 + asdigit(cword[5]);
	int suffix = asdigit(cword[7]) * 100
			+ asdigit(cword[8]) * 10 + asdigit(cword[9]);
//	LOG(yy); LOG(mm); LOG(dd); LOG(suffix);

	if (since1954) {
		suffix *= 10;
		suffix += asdigit(cword[10]);
		// check modulo 11
		long long whole = yy * 100000000L
			+ mm * 1000000L + dd * 10000L + suffix;
//		LOG(whole);
		if (whole % 11 != 0)
			return "invalid";
	}

	// check month & get gender
	bool boy = mm >= 1 && mm <= 12;
	if (!boy && !(mm >= 51 && mm <= 62))
		return "invalid";
	int month = boy ? mm : (mm - 50);
//	LOG(month);
//	LOG(boy);

	// check year
	if (since1954) {
		if (! ((yy >= 0 && yy <= 9) || (yy >= 54 && yy <= 99)) )
			return "invalid";
	}
	else if (! (yy >= 10 && yy <= 53) )
		return "invalid";

	// check day
	int maxdd = 31;
	switch (month) {
		case 1: case 3: case 5: case 7: case 8: case 10: case 12:
			maxdd = 31; break;
		case 4: case 6: case 9: case 11:
			maxdd = 30; break;
		case 2:
			maxdd = (yy % 4 == 0) ? 29 : 28; break;
	}
//	LOG(maxdd);
	if (dd < 1 || dd > maxdd)
		return "invalid";

	return boy ? "boy" : "girl";
}