#include <iostream>
#include <cstring>
#include <stdio.h>
#include <stdlib.h>

using namespace std;

int fff (char* data) {
	return (10*(data[0]-'0')+(data[1]-'0'));
}

int main(int argc, char** argv)
{
	char inputL[21];
	while (true) {
		cin.getline(inputL, 21);
		if (strcmp(inputL, "end") == 0) {
			break;
		}
		
		int length = strlen(inputL);
		if ((length != 10) and (length != 11)) {
			cout << "invalid\n";
			continue;
		}
		bool stop = false;
		for ( int i = 0; i < 6; i++) {
			if ( (inputL[i] < '0') or (inputL[i] > '9') ) {
				stop = true;
			}
		}
		if ( inputL[6] != '/' ) {
			stop = true;
		}
		for ( int i = 7; i < length; i++) {
			if ( (inputL[i] < '0') or (inputL[i] > '9') ) {
				stop = true;
			}
		}
		if (stop) {
			cout << "invalid\n";
			continue;
		}
		int rok = fff(inputL);
		int mesic = fff(inputL+2);
		int den = fff(inputL+4);
		if ( (rok >= 10) and (rok <= 19) ) {
			cout << "invalid\n";
			continue;
		}
		if ( length == 10 ) {
			if ( rok >= 54 ) {
				cout << "invalid\n";
				continue;
			}
		} else {
			if ( (rok < 54) and (rok > 19) ) {
				cout << "invalid\n";
				continue;
			}
		}
		bool prestupny = false;
		if (rok % 4 == 0) {
			prestupny = true;
		}
		if (rok % 100 == 0) {
			prestupny = false;
		}
		if (rok % 400 == 0) {
			prestupny = true;
		}
		
		bool holka = false;
		
		int mesic2 = mesic;
		if ( mesic > 50 ) {
			holka = true;
			mesic2 -= 50;
		}
		
		if ((mesic2 == 0) or (mesic2 > 12)) {
			cout << "invalid\n";
			continue;
		}
		
		int maxDay = 0;
		switch (mesic2) {
			 case 1 : maxDay = 31; break;
			 case 2 : maxDay = 28 + prestupny; break;
			 case 3 : maxDay = 31; break;
			 case 4 : maxDay = 30; break;
			 case 5 : maxDay = 31; break;
			 case 6 : maxDay = 30; break;
			 case 7 : maxDay = 31; break;
			 case 8 : maxDay = 31; break;
			 case 9 : maxDay = 30; break;
			 case 10 : maxDay = 31; break;
			 case 11 : maxDay = 30; break;
			 case 12 : maxDay = 31; break;
		}
		
		if (den > maxDay) {
			cout << "invalid\n";
			continue;
		}
		
		int cislo = atoi(inputL+7);
		
		unsigned long long datum = (rok*10000+mesic*100+den);
		datum *= 10000;
		datum += cislo;
		
		if (datum % 11 != 0 ) {
			cout << "invalid\n";
			continue;
		}
		
		if (holka) {
			cout << "girl\n";
		} else {
			cout << "boy\n";
		}
		
	}
	return 0;
}