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


char vstup[25];

bool load();
bool delim(int delka);

int main()
{
	 
 	
	
	while(true)
		{
			if(load())
			{
				if(vstup[2]=='1'||vstup[2]=='0')printf("boy\n");
				else printf("girl\n");
			}

				else 
				{
					if(vstup[0]=='e')break;
					printf("invalid\n");
				}
		}
	printf("\n");

	return 0;
}


bool load()
{
	int rok=0;
	
	scanf("%s",vstup);
	int delka=strlen(vstup);

	if(delka!=10 && delka!=11) return false;
	
	if(!delim(delka))return false;
	if(vstup[6]!='/') return false;
	for(int i=0;i<delka-1;i++)
	{
		if(i!=6)
		{
			if(vstup[i]-'0'>=0 && vstup[i]-'0'<=9);
			else return false;
		}
	}

	rok=10*(vstup[0]-'0')+(vstup[1]-'0');
	int mesic=10*(vstup[2]-'0')+vstup[3]-'0';
	if (mesic>50)mesic=mesic-50;
	int den=10*(vstup[4]-'0')+vstup[5]-'0';
	int rok2;
	
	if(rok>=20)rok2=rok+1900;
	else rok2=rok+2000;
	
	if(mesic>12 || mesic ==0)return false;

	//printf("%d %d %d \n",rok2,mesic,den)	;

	if(rok2 % 400 ==0)
		{
			if(mesic==2 && den>29)return false;		
		}
	else if(rok2 % 4==0 && rok2 % 100!=0)
		{
			if(mesic==2 && den>29)return false;
		}
	else 	
		{	
			if(mesic==2 && den>28)return false;
		}
	
	switch (mesic)
		{
			case 1: case 3: case 5: case 7: case 8: case 10: case 12:
				if(den>31)return false;break;
			case 4: case 6: case 9: case 11: 
				if(den>30)return false;break;
		}
	if(den==0)return false;

	//printf("rok %d  %d %d\n",rok,vstup[0]-'0',vstup[1]-'0');
	if(rok2<1920  || rok2>2009)return false;
	if(rok2>1919 &&rok2<1954 && delka!=10)return false;
	if(rok2>1953 && rok2<2010 && delka!=11)return false;
		

 return true;
}

bool delim(int delka)
{
	//printf("delka    %d\n\n",delka);
	int pole[11];
	pole[0]=vstup[0]-'0';
	pole[1]=vstup[1]-'0';
	pole[2]=vstup[2]-'0';
	pole[3]=vstup[3]-'0';
	pole[4]=vstup[4]-'0';
	pole[5]=vstup[5]-'0';
	pole[6]=vstup[7]-'0';
	pole[7]=vstup[8]-'0';
	pole[8]=vstup[9]-'0';
	if(delka==11) pole[9]=vstup[10]-'0';
	else 
	{
	pole[9]=pole[8];
	pole[8]=pole[7];
	pole[7]=pole[6];
	pole[6]=0;
	
	}
	//for(int i=0;i<10;i++)printf("%d",pole[i]);
	

	int pom1=0;
	
		

	pom1=pole[0]*10+pole[1];
	
	for(int i=0;i<9;i++)
	{
		
		
		pom1=pom1-((pom1/11)*11);
		

		if(i+2>9)pom1=pom1*10;
		else pom1=pom1*10+pole[i+2];
	//printf("\n %d \n",pom1);				
		
	}
	
	if (pom1!=0)return false;
	
	return true;


}