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

int main()
{
  string       line ;
  unsigned int i ;
  bool         male ;
  int          y, m, d, r, ty ;

c1: 
  while (getline(cin, line) && (line != "end"))
  {
    male = true;

    if (line.length() != 10 && line.length() != 11)
    {
      cout << "invalid" << endl ;
      continue ;
    }

    for (i = 0 ; i < line.length() ; i++)
    {
      if (i == 6)
      { 
        if (line[i] != '/')
        {
          cout << "invalid" << endl ;
          goto c1 ;
        }
      }
      else if (line[i] == '/')
      {
        cout << "invalid" << endl ;
        goto c1 ;
      }
    }

    i = 0 ;

    ty = y = (line[0] - '0') * 10 + (line[1] - '0') ;
    m = (line[2] - '0') * 10 + (line[3] - '0') ;
    d = (line[4] - '0') * 10 + (line[5] - '0') ;

    if (line.length() == 10)
    {
        if (y >= 54 || y < 20)
        {
          cout << "invalid" << endl ;
          continue ;
        }

        y = 19 * 100 + y ;
    	r = (line[7] - '0') * 100 + (line[8] - '0') * 10 + (line[9] - '0') ;

        //check = y * 10000000 + m * 100000 + d * 1000 + r ;
    }
    else
    {
        if (y < 54 && y > 9)
        {
          cout << "invalid" << endl ;
          continue ;
        }
        else if (y < 54 && y > 8)
          y = 1900 + y ;
        else
          y = 2000 + y ;

        r = (line[7] - '0') * 1000 + (line[8] - '0') * 100 + (line[9] - '0') * 10 + (line[10] - '0') ;

        if ((((((ty % 11) * 100 + m) % 11) * 100 + d) % 11 * 10000 + r) % 11 != 0)
        {
          cout << "invalid" << endl ;
          continue ;
        }
     }

    if (m > 50)
    {
      m -= 50 ;
      male = false ;
    } 

    switch (m)
    {
      case 1: case 3: case 5: case 7: case 8: case 10: case 12:
        if (d < 1 || d > 31)
        {
          cout << "invalid" << endl ;
          continue ;
        }
        break ;

      case 4: case 6: case 9: case 11:
        if (d < 1 || d > 30)
        {
          cout << "invalid" << endl ;
          continue ;
        }
        break ;

      case 2:
        if (d < 1 || d > 28 + ((y % 4 == 0 && (y % 100 != 0 || y % 1000 == 0))))
        {
          cout << "invalid" << endl ;
          continue ;
        }
        break ;

      default:
        cout << "invalid" << endl ;
        continue ;
    }

    cout << (male ? "boy" : "girl") << endl ;
  }
  return 0 ;
}