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

int main (int argc, char ** argv) {
	char buffer[21];
	int y = 0;
	int m = 0;
	int d = 0;
	int l = 0;
	int s = 0;
	unsigned long long int num = 0;
	while (gets(buffer)) {
		if (strcmp("end", buffer) == 0) {
			break;
		}
		l = strlen(buffer);
		if (l > 11 || l < 10) {
			printf("invalid\n");
			continue;
		}
		if (buffer[0] == '/' || buffer[1] == '/') {
			printf("invalid\n");
			continue;
		}
		y = (buffer[0] - '0') * 10 + (buffer[1] - '0');
		if (buffer[2] == '/' || buffer[3] == '/') {
			printf("invalid\n");
			continue;
		}
		m = (buffer[2] - '0') * 10 + (buffer[3] - '0');
		if (m < 1 || (m > 12 && m < 51) || m > 62) {
			printf("invalid\n");
			continue;
		}
		if (buffer[4] == '/' || buffer[5] == '/') {
			printf("invalid\n");
			continue;
		}
		d = (buffer[4] - '0') * 10 + (buffer[5] - '0');
		if (d < 1 || d > 31) {
			printf("invalid\n");
			continue;
		}
		switch (m) {
		case 2 : if (y % 4 == 0) {
				if (d > 29) {
					printf("invalid\n");
					continue;
				}
			} else {
				if (d > 28) {
					printf("invalid\n");
					continue;
				}
			}
			break;
		case 4:
		case 6:
		case 9:
		case 11:
			if (d == 31) {
				printf("invalid\n");
				continue;
			}
		}
		if (buffer[6] != '/') {
			printf("invalid\n");
			continue;
		}
/*		printf("%d %d %d\n", y, m, d); */
		if (y >= 10 && y <= 19) {
			printf("invalid\n");
			continue;
		}
		if (y >= 54 || (y >= 0 && y <= 9)) {
			if (l == 10) {
				printf("invalid\n");
				continue;
			}
			if (buffer[7] == '/' || buffer[8] == '/' || buffer[9] == '/' || buffer[10] == '/') {
				printf("invalid\n");
				continue;
			}
			s = (buffer[7] - '0') * 1000 + (buffer[8] - '0') * 100 + (buffer[9] - '0') * 10 + (buffer[10] - '0');
			num = 100000000;
			num *= y;
			num += m * 1000000 + d * 10000 + s;
			if (num % 11 == 0) {
				if (m > 50) {
					printf("girl\n");
				} else {
					printf("boy\n");
				}
			} else {
				printf("invalid\n");
				continue;
			}
		} else  if (y >=20 && y < 54) {
			if (l == 11) {
				printf("invalid\n");
				continue;
			}
			if (buffer[7] == '/' || buffer[8] == '/' || buffer[9] == '/') {
				printf("invalid\n");
				continue;
			}
			if (m > 50) {
				printf("girl\n");
			} else {
				printf("boy\n");
			}
		}
	}
	return(0);
}