#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<cstring>

#define SIZE 20
using namespace std;

char str[SIZE];
int pole[SIZE];

int months[12] = {31,28,31,30,31,30,31,31,30,31,30,31};

int main() {
	bool inv;
	while(true) {
		inv=false;
		bool boy = true;
		bool lo = false;
		fgets(str, SIZE, stdin);
		if(str[0] == 'e') {
			//rintf("end\n");
			return 0;
		}
		
		if(strlen(str) < 11 || str[6]!='/'){
			printf("invalid\n");
			continue;
		}
		
		for(int i=0;i<6;i++){
			if(str[i]=='/'){
				printf("invalid\n");
				inv=true;
				continue;
			}
			pole[i]=str[i]-'0';			
		}
		
		for(int i=7;i<10;i++){
			if(str[i]=='/'){
				printf("invalid\n");
				inv=true;
				continue;
			}
			pole[i-1]=str[i]-'0';	
		}
		if (inv) continue;
		if(str[10] != '\n') {
			pole[9] = str[10] - '0';	
			lo = true;			
			if(str[11]!='\n') {
				printf("invalid\n");
				continue;
			}
				
		}
		int y = pole[0]*10 + pole[1];
		if(y < 20 && y > 9) {
			printf("invalid\n");
			
				continue;
		}
		if( ((!lo) && (y>53 || y<10)) || (lo && (y<54 && y > 9))) {
			printf("invalid\n");			
				continue;
		}
		
		int m = pole[2]*10 + pole[3];
		if(m >= 50) {
			m -= 50;
			boy = false;
		}
		if(m > 12 ) {
			printf("invalid\n");
				continue;
		}
		int d = pole[4]*10 +pole[5];
		//printf("%d %d %d\n", y, m, d);
		if(months[m-1] < d) {
			if(m == 2 && d==29 && (y%4==0)) {
				//ok
				//printf("anjdlafjl\n");
			}else {
					printf("invalid\n");
				//printf("defja;dfld\n");
				continue;
			}
		}
		
		if(lo) {
			int odd[2] = {0, 0};
			
			for(int i=0; i<10; i++) {
				odd[i%2] += pole[i];
			}
			if(abs(odd[0]-odd[1]) % 11 != 0) {
					printf("invalid\n");
				continue;
			}
		}
		if(boy) 
			printf("boy\n");
		else
			printf("girl\n");
	}
	return 0;
}