#include <cstdio>
#include <cstring>

#define INVALID	{ printf("invalid\n"); continue;}

int main()
{
	char s[50];

	unsigned long long int yr, mth, dy, gb, check;
	int len;
	unsigned int i;
	do
	{
		scanf("%s", s);
		if (strcmp(s, "end") == 0) break;
		len = strlen(s);
		if (strlen(s) > 11 || strlen(s) < 10)
			INVALID
			for (i=0;i<strlen(s);i++)
		{
			if (i == 6 && s[i] != '/')
				INVALID
			if (i != 6 && (s[i] < '0' || s[i] > '9'))
				INVALID
		}
		sscanf(s + 7, "%Lu", &check);
		s[6] = 0;
		sscanf(s + 4, "%Lu", &dy);
		s[4] = 0;
		sscanf(s + 2, "%Lu", &mth);
		s[2] = 0;
		sscanf(s, "%Lu", &yr);
		if (yr < 20 && yr > 9) INVALID
		if (yr < 54 && yr > 9 && len == 11) INVALID
		if (yr < 54 && yr > 9 && len == 10) check *= 10;
		if ((yr > 53 || yr <= 9) && len == 10) INVALID

		if (mth > 12 && mth < 51) INVALID
		if (mth > 62) INVALID
		if (mth == 0) INVALID
		if (mth > 50) gb = 1;
		else gb = 0;

		switch((mth > 50) ? (mth - 50) : mth)
		{
			case 1:
			case 3:
			case 5:
			case 7:
			case 8:
			case 10:
			case 12:
				if (dy > 31 || dy == 0) INVALID
				break;
			case 4:
			case 6:
			case 9:
			case 11:
				if (dy > 30 || dy == 0) INVALID
				break;
			case 2:
				if ((yr % 4) && dy > 28) INVALID
				else if (dy > 29) INVALID
				if (dy == 0) INVALID
				break;
			default:
				INVALID

		}
		
		if (len == 11)
			if ( (  ((yr
				* 100 + mth)
				* 100 + dy)
				* 10000 + check ) % 11 ) INVALID
		if (gb) printf("girl\n");
		else printf("boy\n");
	}
	while(1);
	return 0;
}