#include <iostream>
#include <iomanip>
#include <cstdio>
# include <cstring>

using namespace std;

char riadok[30];
int rok, mesiac, den, zvysok;

bool spravnyformat(int length){
	//cout << "Len = " << length<< endl;
	for (int i = 0; i < length; i++){
		if(!isdigit(riadok[i])){
			 if ( !( (i == 6) && riadok[i] == '/') ) {
				//cout << "spravnyformat vracia false" << endl;
				return false;
			}
		}
	}
	return true;
}

int pocetDni[] = {31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

bool spravnyden(){
	if (den == 0) return false;
	
	if (rok <=9) rok +=2000;
	else rok += 1900;
	
	if (mesiac == 2){
		if (den > 28){
			if (den > 29) return false;
			//mame 29 februar
			if (rok%4 == 0) {
				/*if (rok%100==0) {
					if (rok%400==0) return true;
					else  return false;
					//((rok%100==0) && (rok%400==0))
				} else return true;*/
			} else return false;
		}
		
	} else {
		if (den > pocetDni[mesiac-1]) return false;
	}
	return true;
}

bool delitelny11(){
/*	int parne = 0;
	int neparne = 0;
	
	for (int i = 0; i < 6; i++){
		//cout << "r === " << (riadok[i] - '0') << endl;
		if (i%2==0) { parne = parne + (riadok[i]-'0'); }
		else neparne = neparne + (riadok[i]-'0');
	}
	for (int i = 7; i < 11; i++){
		//cout << "r === " << (riadok[i] - '0') << endl;
		if (i%2==0) neparne = neparne + (riadok[i]-'0');
		else  parne = parne + (riadok[i]-'0');
	}
	//cout << "parne = " << parne << " a neparne = " << neparne << endl;
	return (parne == neparne);
*/	
	long long cislo = riadok[0] - '0';
	
	for(int i = 1; i < 11; i++)
	{
		if(i == 6) continue;
		cislo = cislo * 10;
		cislo = cislo + riadok[i] - '0';
	}
	
	//cout <<  riadok << "===== " << cislo << endl;
	return (!(cislo%11));
}

int getint(int start, int end){
	int ret = riadok[start] - '0';
	for (int i = start+1; i < end; i++){
		ret *= 10;
		ret += riadok[i] - '0';
	}
	return ret;
}

int main(){
	int length;
	bool chlapec, chyba, delit;
	
	while (true){
		cin.getline(riadok, 30);
		length = strlen(riadok);
		if (length == 3){ //mozny end
			if (strcmp(riadok, "end") == 0) break; //dosiahli sme end
			cout << "invalid" << endl;
		} else if ((length == 10) || (length == 11)) { //spravne cislo ma dlzku 9 alebo 10 plus lomitko
			chyba = false; delit = false; chlapec = true;
			if (spravnyformat(length)){
				//cout << "spracuvavam vstup" << endl;
				rok = getint(0,2);
				mesiac = getint(2,4);
				den = getint(4,6);
				zvysok = getint(7,length);
				//rok
				if ((rok >= 20) || (rok <= 9)){
					if (rok >= 54 || rok<=9) {
						delit = true;
						if (length != 11){
							cout << "invalid" << endl;
							continue;
						}
					}
					else {
						if (length != 10){
							cout << "invalid" << endl;
							continue;
						}
					}
					if ( (mesiac >= 1 && mesiac <=12) || (mesiac >= 51 && mesiac <=62) ){
						//mesiac
						if (mesiac > 12) { chlapec = false; mesiac -=50; }
						//den
						if (spravnyden()){
							if (delit){
								if (!delitelny11()) {
									chyba = true;
								//	cout << "nie je delitelny 11" << endl;
								}
							}
							//cout << "spravny den" << endl;
						} else {
							//cout << "chyba spravny den" << endl;
							chyba = true;
						}
					} else chyba = true;
				} else chyba = true;
			} else chyba = true;
			
			if (chyba) {
				cout << "invalid" << endl;
			}
			else {
				cout << (chlapec?"boy":"girl") << endl;
			}
			
		} else { //nespravna dlzka vstupu -> invalid
			cout << "invalid" << endl;
		}
	}
	
	return 0;
}