#include <stdio.h>
#include <string.h>

int months[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

int main() {
	char s[100];
	int i, len;
	for (;;) {
		scanf("%s", s);
		if (s[0] == 'e') break;
		if ((len = strlen(s)) < 10) printf("invalid\n");
		else {
			if (s[6] != '/') printf("invalid\n");
			else {
				for (i = 0; i < len; i++) {
					if (i == 6) continue;
					if (s[i] == '/') break;
				}
				if (i != len) printf("invalid\n");
				else {
					int d, r, m;
					bool girl = false;
					r = (s[0] - '0')*10 + s[1] - '0';
					m = (s[2] - '0')*10 + s[3] - '0';
					d = (s[4] - '0')*10 + s[5] - '0';
//					printf("%d %d %d\n", r, m, d);
					if (m > 12) {m -= 50; girl = true; }
					if (m <= 0 || m > 12 || d <= 0 || d > 31 || (r>9 && r < 20)) {printf("invalid\n"); continue;}
					if (r % 4 == 0 && m == 2) d -= 1;
					if (d > months[m]) {printf("invalid\n"); continue;}
					if (r < 54 && r > 19) {
						if (len == 11) {printf("invalid\n"); continue;}
					} else {
						if (len == 10) {printf("invalid\n"); continue;}
						i = 0;
						i += s[0]-0;
						i -= s[1]-0;
						i += s[2]-0;
						i -= s[3]-0;
						i += s[4]-0;
						i -= s[5]-0;
						i += s[7]-0;
						i -= s[8]-0;
						i += s[9]-0;
						i -= s[10]-0;
						if (i % 11 != 0) {printf("invalid\n"); continue;}
					}
					if (girl) printf("girl\n");
					else printf("boy\n");
				}
			}
		}
	}
	return 0;
}