#include<iostream>
#include <sstream>
using namespace std;

void die(){
	cout << "invalid" << endl;
}

int M[12] = {  31, 28, 31, 30,31,30,31,31,30,31,30,31 };

int main(){

	while(true){
		string s;
		cin >> s;
		if (s == "end") break;
		if (s.length() < 10 || s.length() > 11){
			die();
			continue;
		}
		if (s[6] != '/'){
			die();
			continue;
		}
		for (int i=0;i<s.length(); i++)if (i!=6){
			if (s[i] < '0' || s[i] > '9'){
				die();
				continue;
			}
		}

		string ans = "boy";

		string y = s.substr(0,2);
		string m = s.substr(2,2);
		string d = s.substr(4,2);
		
//		cout << "T " << y << endl;

		istringstream isy(y);
		int year; isy >> year;
		if ( year > 53 || year < 10){
			if (s.length() == 10){
				die();
				continue;
			}
		}else{
			if (s.length() == 11){
				die();
				continue;
			}	
		}
		
		if (year > 9 && year < 20){
			die();
			continue;
		}

//		cout << "t2 " << endl;

		istringstream ism(m);
		int month; ism >> month;
		if (month == 0){ die(); continue;}
		if (month > 12 && month <= 50){
			die(); continue;			
		}
		if (month > 50 && month <= 62){
			ans = "girl";
			month -= 50;
		}
		if (month > 62){
			die(); continue;
		}

		month--;

		//dni .. fck :(
		int day; istringstream isd(d);
		isd >> day;
			
		if (day == 0){
			die();
			continue;
		}

		
			
		if (month == 1){
			if (year % 4 == 0){
				if (day > M[1]+1){
					die();
					continue;
				}
			}else{
				if (day > M[month]){
					die();
					continue;
				}
			}

		}else{
			if (day > M[month]){
				die();
				continue;
			}
		}
		

		if (s.length() == 11){
			string prve = s.substr(0,6);
			string druhe = s.substr(7,s.length()-7);
			long long a;
			istringstream is(prve+druhe);
			is >> a;
			if (a % 11 != 0){
				die();
				continue;
			}
		}
		
		

		
			
		cout << ans << endl;
	}

	return 0;
}