import java.io.*;
import java.util.*;

public class ii
{

	public static void main(String[] args) throws Exception {
		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
		String s;

		while(true)
		{
			s = bf.readLine();

			if(s.equals("end"))
			{
				//System.out.println("end");
				break;
			}
			if (s.length()!=10&&s.length()!=11)
			{
				System.out.println("invalid");
				continue;
			}
			
			String [] casti = s.split("/");
			if (casti.length!=2)
			{
				System.out.println("invalid");
				continue;
			}
			
			
			try
			{
				long date = Integer.parseInt(casti[0]);
				long end = Integer.parseInt(casti[1]);
				boolean zena = false;
				
				long year = date/10000;
				//date -=year*10000;
				int month = (int)(date-year*10000)/100;
				long day = date%100;
				if (year<20&&year>9)
				{
					System.out.println("invalid");
					continue;
				}
				if (month>50) {
					zena = true;
					month -=50;
				}
				
				if (day>31||month>12||day==0||month==0)
				{
					System.out.println("invalid");
					continue;
				}
				switch(month){
					case 4:
					case 6:
					case 9:
					case 11:
						if(day>30){
							System.out.println("invalid");
							continue;
						}
						break;
					case 2:
						if(day>29 || ((year%4)!=0 && day == 29)){
							System.out.println("invalid");
							continue;
						}
						/*if(year == 0 && day == 29){
							System.out.println("invalid");
							continue;
						}*/
				
				
				}
				
				if (year>=54||year<=9)
				{
					if (casti[1].length()!=4) {
						System.out.println("invalid");
						continue;
					}
					if ((date*10000+end)%11!=0)
					{
						System.out.println("invalid");
						continue;
					}
				} else
				{
					if (casti[1].length()!=3) {
						System.out.println("invalid");
						continue;
					}
				}
				
				if (zena)
				{
					System.out.println("girl");
				} else
				{
					System.out.println("boy");
				}
			}
			catch (NumberFormatException e)
			{
				System.out.println("invalid");
				continue;
			}
			
			
		}



	}
}