/*
 *      ii.C
 *      
 *      Copyright 2009 Contest team 42 <cteam42@pc-11>
 */


#include <iostream>
#include <cstring>
#include <sstream>
#include <cmath>

using namespace std;

int main(int argc, char** argv)
{
	char tmp[20];
	string line;
	
	int day,month,year,parity,a,b,i;
	int rc;
	int pos_lomitko;
	bool boy;
	
	//cout << sizeof(long long) << endl;
	
	istringstream iss;
	
	while(1){
	
		cin.getline(tmp,20);
		
		line = tmp;
		
		if(line.length() > 11) {
			cout << "invalid" << endl;
			continue;
		}
		
		if (line == "end") break;
		
		//istringstream iss(line);
		
		pos_lomitko = line.find('/',0);
		
		if (pos_lomitko != 6 || (line.length() - pos_lomitko - 1 != 4 && line.length() - pos_lomitko - 1 != 3)){
			cout << "invalid" << endl;
			continue;
		}
		
		for(i=0; i<5; i++){
			if (line[i] > '9' || line[i] < '0'){
				cout << "invalid" << endl;
				continue;
			}
		}
		
		if (line[6] != '/'){
			cout << "invalid" << endl;
			continue;			
		}
		
		for(i=7; i<line.length(); i++){
			if (line[i] > '9' || line[i] < '0'){
				cout << "invalid" << endl;
				continue;
			}
		}		
		
		//cout << pos_lomitko;
		
		iss.clear();
		iss.str(line.substr(0,2));
		//tmp = iss.str().c_str();
		//sscanf(&tmp, "%d", &year);
		iss >> year;
		//cout << iss.str() << endl;
		//cout << year << endl;
		
		iss.clear();
		iss.str(line.substr(2,2));		
		iss >> month;

		iss.clear();		
		iss.str(line.substr(4,2));		
		iss >> day;

		iss.clear();
		iss.str(line.substr(pos_lomitko+1,line.length() - pos_lomitko - 1));		
		iss >> parity;
		
		if (year > 9 && year < 20){
			cout << "invalid" << endl;
			continue;
		}
		
		if (year < 54 && year >= 20){			
			if (line.length() > 10){
				cout << "invalid" << endl;
				continue;
			}

		}
		else{
			rc = 0;
			for (a=0; a<6; a++){
				iss.clear();
				iss.str(line.substr(a,1));		
				iss >> b;
				rc += b * pow(-1,a);
			}
			
			for (a=7; a<11; a++){
				iss.clear();
				iss.str(line.substr(a,1));		
				iss >> b;
				rc += b * pow(-1,a+1);
			}
			
			
		//rc = parity + day * 10000 + month * 1000000 + year * 100000000;
		//a = rc % 11;
		if (rc % 11 != 0){
			cout << "invalid" << endl;
			continue;
		}
	}
		
			if (month > 50){
					boy = false;
					month -= 50;
			}
			else{
				boy = true;
			}
		
			if (month < 1 || month > 12){
				cout << "invalid" << endl;
				continue;				
			}
			else{
				if (day < 1){
					cout << "invalid" << endl;
					continue;	
				}
				
				if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12){
					if (day > 31)
					{
						cout << "invalid" << endl;
						continue;					
					}
				}
				else{				
					if (month == 2){
						if ((year % 4 == 0 && day > 29) || (year % 4 != 0 && day > 28)){
							cout << "invalid" << endl;
							continue;					
						}
					}
					else if (day > 30){
						cout << "invalid" << endl;
						continue;					
					}
				}
			}
		
			if (boy) cout << "boy" << endl;
			else cout << "girl" << endl;

		

	}	
	return 0;
}