#include <iostream>
#include <sstream>

using namespace std;

int main(int argc, char **argv)
{
	string s;
	int pripad = 0;
	while(true)
	{
		pripad++;
		getline(cin, s);
		if(s == "end") break;
		istringstream is(s);
		int pos = 0;
		int rok = 0, mesic = 0, den = 0;
		int delitelnost = 0;
		bool boy;
		bool br;
		//cout << sizeof(long long) << endl;
		do
		{
			br = false;
			if((pos > 10)) break;
			char c = 0;
			is >> c;
			if(is.fail()) break;
			//cout << "pos: " << pos << "c: " << c << endl;
			if(pos < 6 && !(c >= '0' && c <= '9'))
			{
				cout  << "invalid" << endl;
				//cin.ignore(1000, '\n');
				br = true;
				break;
			}
			else if (pos == 6 && c != '/')
			{
				cout   << "invalid" << endl;
				//cin.ignore(1000, '\n');
				br = true;
				break;
			}
			else if((pos > 6 && !(c >= '0' && c <= '9')))
			{
				cout   << "invalid" << endl;
				//cin.ignore(1000, '\n');
				br = true;
				break;
			}
			switch (pos)
			{
				case 0:
					rok += 10*(c-'0');
					delitelnost += (c-'0');
					break;
				case 1:
					rok += 1*(c-'0');
					delitelnost -= (c-'0');
					break;
				case 2:
					mesic += 10*(c-'0');
					delitelnost += (c-'0');
					break;
				case 3:
					mesic += 1*(c-'0');
					delitelnost -= (c-'0');
					break;
				case 4:
					den += 10*(c-'0');
					delitelnost += (c-'0');
					break;
				case 5:
					den += 1*(c-'0');
					delitelnost -= (c-'0');
					break;
				case 7:
					delitelnost += (c-'0');
					break;
				case 8:
					delitelnost -= (c-'0');
					break;
				case 9:
					delitelnost += (c-'0');
					break;
				case 10:
					delitelnost -= (c-'0');
					if(delitelnost % 11 != 0)
					{
						cout   << "invalid" << endl;
						br = true;
					}
					break;
			}
			pos++;
			if(br == true) break;
		} while (is.good());
		if(br) continue;
		int feb = 0;
		if (rok % 4 == 0)
			feb = 29;
		else
			feb = 28;
		int pocdnu[] = {31, feb, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

		if(mesic >= 1 && mesic <= 12)
			boy = true;
		else if(mesic >= 51 && mesic <= 62)
			boy = false;
		else
		{
			cout << "invalid" << endl;
			continue;
		}

		if(pocdnu[(mesic%50)-1] < den)
		{
			cout  << "invalid" << endl;
			continue;
		}

		if(rok < 20) rok += 100;
		if(rok > 109)
		{
			cout  << "invalid" << endl;
			continue;
		}
		if(pos == 10 && rok > 53)
		{
			cout  << "invalid" << endl;
			continue;
		}
		if(pos == 11 && rok < 54)
		{
			cout  << "invalid" << endl;
			continue;
		}
		
		cout   << (boy ? "boy" : "girl") << endl;

		/*cout   << "rok: " << rok << "mesic: " << mesic << "den: " << den
			<< "delitenlost: " << delitelnost << endl;*/
		//cout << s << endl;
	}
	return 0;
}