#include <iostream>
#include <cstdio>

using namespace std;

bool same(bool a[], int cisla[], int pocet)
{
	bool b[9];
	for(int i = 0; i < 9; i++)
		b[i] = false;
		
	for(int i = 0; i < pocet; i++)
		b[cisla[i]] = true;
		
	for(int i = 0; i < 9; i++)
		if(a[i] != b[i])
			return false;
	return true;
}

int main()
{
	bool kostka[9];
	char znak;
	int cisla[9];
	
	for(int i = 0; i < 9; i++)
	{
		kostka[i] = false;
		cin >> znak;
		if(znak == 'o')
			kostka[i] = true;
	}
	
	cisla[0] = 4;
	if(same(kostka,cisla,1))
	{
		cout << 1 << endl;
		return 0;
	}
	
	cisla[0] = 0;
	cisla[1] = 8;
	if(same(kostka,cisla,2))
	{
		cout << 2 << endl;
		return 0;
	}
	
	cisla[0] = 2;
	cisla[1] = 6;
	if(same(kostka,cisla,2))
	{
		cout << 2 << endl;
		return 0;
	}
	
	cisla[0] = 0;
	cisla[1] = 4;
	cisla[2] = 8;
	if(same(kostka,cisla,3))
	{
		cout << 3 << endl;
		return 0;
	}
	
	cisla[0] = 2;
	cisla[1] = 4;
	cisla[2] = 6;
	if(same(kostka,cisla,3))
	{
		cout << 3 << endl;
		return 0;
	}
	
	cisla[0] = 0;
	cisla[1] = 2;
	cisla[2] = 6;
	cisla[3] = 8;
	if(same(kostka,cisla,4))
	{
		cout << 4 << endl;
		return 0;
	}
	
	cisla[0] = 0;
	cisla[1] = 2;
	cisla[2] = 4;
	cisla[3] = 6;
	cisla[4] = 8;
	if(same(kostka,cisla,5))
	{
		cout << 5 << endl;
		return 0;
	}
	
	cisla[0] = 0;
	cisla[1] = 1;
	cisla[2] = 2;
	cisla[3] = 6;
	cisla[4] = 7;
	cisla[5] = 8;
	if(same(kostka,cisla,6))
	{
		cout << 6 << endl;
		return 0;
	}
	
	cisla[0] = 0;
	cisla[1] = 3;
	cisla[2] = 6;
	cisla[3] = 2;
	cisla[4] = 5;
	cisla[5] = 8;
	if(same(kostka,cisla,6))
	{
		cout << 6 << endl;
		return 0;
	}
	


	cout << "unknown" << endl;
	return 0;
}