#include <stdio.h>
#include <string.h>
char line[1000];

int mnt[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

bool is(char c)
{
	return (c>='0' && c<='9');
}

int main()
{ 
#define end {printf("invalid\n");continue;}
	while(1)
	{
		fgets(line, 100, stdin);
		line[strlen(line)-1]=0;
		if (!strcmp(line, "end"))
			return 0;
		int len = strlen(line);
		if (len>11 || len <10)
		{
			printf("invalid\n");
			continue;
		}
		int Y = 0;
		int M=0;
		if (!(is(line[0]) && is(line[1])))
			end
		else
			{
				Y=(line[0]-'0')*10+(line[1]-'0');
			}
		//printf("Y %d %c %c", Y, line[0], line[1]);
		if (Y>=10&&Y<20)
			end;
		if (!(is(line[2]) && is(line[3])))
			end
		else
			{
				M=(line[2]-'0')*10+(line[3]-'0');
			}
		bool boy=true;
		if (M>50)
		{
			M-=50;
			boy=false;
		}
		if (M<=0 || M>12)
			end;
		int D;
		if (!(is(line[4]) && is(line[5])))
			end
		else
			{
				D=(line[4]-'0')*10+(line[5]-'0');
			}
		//printf("<%d %d>", M, D);
		if ((Y==0 || (Y % 4)==0) &&M==2)
		{
			if (D<=0 || D>29)
				end
		}
		else if (D<=0 || D>mnt[M])
			end
		if (line[6]!='/')
			end
		int beh=0;
		if ((is(line[7]) && is(line[8]) && is(line[9]) && is(line[10]) && len==11 && ((Y<20)||(Y>53))))
		{
			for (int j=7; j<11; j++)
				beh= beh*10 + line[j]-'0';
		}
		else if ((is(line[7]) && is(line[8]) && is(line[9]) && len==10 && ((Y>=20)&&(Y<54))))
		{
			for (int j=7; j<10; j++)
				beh= beh*10 + line[j]-'0';
		}
		else end
		
		long long vysl = 0;
		if (len==11 && boy)
		{
			vysl = (long long)Y*100000000 + M*1000000 + D*10000+beh;
			if (vysl%11)
				end
		}else if (len==11)
		{
			vysl = (long long)Y*100000000 + (M+50)*1000000 + D*10000+beh;
			if (vysl%11)
				end
		}
		
		if (boy)
			printf("boy\n");
		else
			printf("girl\n");
			
		
		
	}
	
	return 0;
}