#include <iostream>
#include <string>
#include <sstream>

using namespace std;

int main()
{
	while(1)
	{
		string line;
		getline(cin, line);
		if(line == "end")
			break;
		
		if(line.length() != 10 && line.length() != 11)
		{
			cout << "invalid" << endl;
			continue;
		}
		
		if(line[6] != '/')
		{
			cout << "invalid" << endl;
			continue;
		}
		
		int year = 0;
		int month = 0;
		int day = 0;
		long long number = 0;
		bool boy = true;
		bool threeDigs = false;
		
		year = (line[0] - '0') * 10 + (line[1] - '0');
		month = (line[0+2] - '0') * 10 + (line[1+2] - '0');
		day = (line[0+4] - '0') * 10 + (line[1+4] - '0');
		
		string num = line.substr(0, 6);
		if(line.substr(7).length() == 3)
		{
			num += "0";
			threeDigs = true;
		}
		num +=  line.substr(7);
		
		istringstream numStream(num);
		numStream >> number;				
		
		if(number % 11 != 0)
		{
			cout << "invalid" << endl;
			continue;
		}	
		
		if(year >= 54 || year <= 9) 
		{
			if(threeDigs) 
			{
				cout << "invalid" << endl;
				continue;
			}
		}
		else
		{
			if(!threeDigs) 
			{
				cout << "invalid" << endl;
				continue;
			}
		}
		
		
		if(year > 9 && year < 20)
		{
			cout << "invalid" << endl;
			continue;
		}	
		if(month >= 50)
		{
			boy = false;
			month -= 50;
		}
		if(month > 12 || month <= 0)
		{
			cout << "invalid" << endl;
			continue;
		}
		
		int maxDays;
		switch(month)
		{
			case 1:
			case 3:
			case 5:
			case 7:
			case 8:
			case 10:
			case 12:
				// 31 dni v mesici
				if(day > 31 || day == 0)
				{
					cout << "invalid" << endl;
					continue;
				}
				break;
			case 2:
				// unor
				maxDays = 28;
				if(year % 4 == 0)
					maxDays = 29;
				if(day > maxDays || day == 0)
				{
					cout << "invalid" << endl;
					continue;
				}
				break;
			
			default:
				// 30 dni v mesici
				if(day > 30 || day == 0)
				{
					cout << "invalid" << endl;
					continue;
				}
				break;
			
		}
		if(boy)
			cout << "boy" << endl;
		else
			cout << "girl" << endl;
		
		
	}
	return 0 ;
}