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

int y[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int y2[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

inline int num(char c)
{
	return c - '0';
}

int main()
{
	char l[100];
	while (1)
	{
		gets(l);
		if (!strcmp(l, "end"))
			break;
		int len;
		int state = 0, bad = 0;
		for (len = 0; l[len]; len++)
		{
			if (len == 6)
			{
				if (l[len] != '/')
				{
					bad = 1;
				}
			}
			else
			{
				if (!isdigit(l[len]))
				{
					bad = 1;
				}
			}
		}

		int year = num(l[0])*10+num(l[1]);
		int month = num(l[2])*10+num(l[3]);
		int day = num(l[4])*10+num(l[5]);
		long long int sum = 0;
		for (int i = 0; i < len; i++)
		{
			if (l[i] == '/')
				continue;
			sum = sum*10+num(l[i]);
		}

		if (len == 10)
		{
			if (year > 53 || year < 20)
			{
				//printf("A\n");
				bad = 1;	
			}		
		}
		else if (len == 11)
		{
			if (year < 54 && year > 9)
			{
				//printf("B\n");
				bad = 1;
			}
			if (sum % 11)
			{
				//printf("C\n");
				bad = 1;
			}
		}
		else
		{
			//printf("D\n");
			bad = 1;
		}

		if (month > 50)
			state = 1;
		month %= 50;

		if (month > 12 || month == 0)
		{
			//printf("E\n");
			bad = 1;
		}
		if (!(year % 4))
		{
			if (!(day > 0 && day <= y2[month-1]))
		{
			//printf("F\n");
				bad = 1;
			}
		}
		else
		{
			if (!(day > 0 && day <= y[month-1]))
			{
				//printf("G\n");
				bad = 1;
			}
		}

		if (bad)
			printf("invalid\n");
		else if (state == 0)
			printf("boy\n");
		else
			printf("girl\n");

	}
	return 0;
}