/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/* 
 * File:   main.cpp
 * Author: cteam012
 *
 * Created on October 20, 2018, 11:31 AM
 */

#include <cstdlib>
#include <iostream>

using namespace std;

/*
 * 
 */
int main(int argc, char** argv) {
    char in[3][3];

    for (int i = 0; i < 3; ++i)
        for (int j = 0; j < 3; ++j) {
            cin >> in[i][j];
        }


    if (in[0][0] == ':' && in[0][1] == ':' && in[0][2] == ':' && in[1][0] == ':' && in[1][1] == 'o' && in[1][2] == ':' && in[2][0] == ':' && in[2][1] == ':' && in[2][2] == ':') {
        cout << '1' << endl;
    } else if (in[0][0] == 'o' && in[0][1] == ':' && in[0][2] == ':' && in[1][0] == ':' && in[1][1] == ':' && in[1][2] == ':' && in[2][0] == ':' && in[2][1] == ':' && in[2][2] == 'o') {
        cout << '2' << endl;
    } else if (in[0][0] == ':' && in[0][1] == ':' && in[0][2] == 'o' && in[1][0] == ':' && in[1][1] == ':' && in[1][2] == ':' && in[2][0] == 'o' && in[2][1] == ':' && in[2][2] == ':') {
        cout << '2' << endl;
    } else if (in[0][0] == ':' && in[0][1] == ':' && in[0][2] == 'o' && in[1][0] == ':' && in[1][1] == 'o' && in[1][2] == ':' && in[2][0] == 'o' && in[2][1] == ':' && in[2][2] == ':') {
        cout << '3' << endl;
    } else if (in[0][0] == 'o' && in[0][1] == ':' && in[0][2] == ':' && in[1][0] == ':' && in[1][1] == 'o' && in[1][2] == ':' && in[2][0] == ':' && in[2][1] == ':' && in[2][2] == 'o') {
        cout << '3' << endl;
    } else if (in[0][0] == 'o' && in[0][1] == ':' && in[0][2] == 'o' && in[1][0] == ':' && in[1][1] == ':' && in[1][2] == ':' && in[2][0] == 'o' && in[2][1] == ':' && in[2][2] == 'o') {
        cout << '4' << endl;
    } else if (in[0][0] == 'o' && in[0][1] == ':' && in[0][2] == 'o' && in[1][0] == ':' && in[1][1] == 'o' && in[1][2] == ':' && in[2][0] == 'o' && in[2][1] == ':' && in[2][2] == 'o') {
        cout << '5' << endl;
    } else if (in[0][0] == 'o' && in[0][1] == ':' && in[0][2] == 'o' && in[1][0] == 'o' && in[1][1] == ':' && in[1][2] == 'o' && in[2][0] == 'o' && in[2][1] == ':' && in[2][2] == 'o') {
        cout << '6' << endl;
    } else if (in[0][0] == 'o' && in[0][1] == 'o' && in[0][2] == 'o' && in[1][0] == ':' && in[1][1] == ':' && in[1][2] == ':' && in[2][0] == 'o' && in[2][1] == 'o' && in[2][2] == 'o') {
        cout << '6' << endl;
    } else
        cout << "unknown" << endl;




    return 0;
}