#include <iostream>
#include <cstdio>
#include <string>
#include <cctype>
//#include <string>

using namespace std;

typedef unsigned long int type;

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

inline bool digitsOK(const string & input)
{
  for(int i = input.size(); i--;)
    if((i != 6) && !isdigit(input[i]))
      return false;
  return true;
}

inline int getYear(const string & input)
{
  return (input[0] - '0')*10 + (input[1] - '0');
}

inline int getMonth(const string & input)
{
  int digit1 = input[2] - '0';
  int digit2 = input[3] - '0';
  if(digit1 == 5 || digit1 == 6)
    digit1 -= 5;
  return digit1 * 10 + digit2;
}

inline int getDay(const string & input)
{
  return (input[4] - '0')*10 + (input[5] - '0');
}


inline bool lengthOK(const string & input)
{
  const int year = getYear(input);
  if(year >= 20 && year <= 53)
    return input.size() == 10;
  else if((year >= 54 && year <= 99) || (year >= 00 && year <= 9))
    return input.size() == 11;
  else
    return false;
}

inline bool dateValid(const string & input)
{
  const int year = getYear(input);
  const int month = getMonth(input);
  const int day = getDay(input);
  bool longFebruary = (year % 4) == 0;
  
  switch(month)
  {
    case 1:
    case 3:
    case 5:
    case 7:
    case 8:
    case 10:
    case 12:
      return (day <= 31 && day >= 1);
      break;
    case 4:
    case 6:
    case 9:
    case 11:
      return (day <= 30 && day >= 1);
      break;
    case 2:
      if(longFebruary)
	return (day <= 29 && day >= 1);
      else
	return (day <= 28 && day >= 1);
      break;
    default:
      return false;
      break;
  }
}

inline bool moduloOK(const string & input)
{
  if(input.size() != 11)
    return true;
  long num = 0;
  for(unsigned int i = 0; i < input.size(); i++)
    if(isdigit(input[i]))
    {
      const int digit = input[i] - '0';
      num = (digit + num * 10) % 11;
    }
  return ((num % 11) == 0);
}

int main(){
  string input;
  while(getline(cin, input), input != "end")
    if((input.size() != 11) && (input.size() != 10))
      invalid();
    else if(input[6] != '/')
      invalid();
    else if(!digitsOK(input))
      invalid();
    else if(!lengthOK(input))
      invalid();
    else if(!dateValid(input))
      invalid();
    else if(!moduloOK(input))
      invalid();
    else
    {
      switch(input[2])
      {
	case '0':
	case '1':
	  cout << "boy" << endl;
	  break;
	case '5':
	case '6':
	  cout << "girl" << endl;
	  break;
	default:
	  invalid();
	  break;
      }
    }
  
  return 0;
}