#include<stdio.h>
#include<stdlib.h>

int main(int argc, char** argv){
    char die[4][4];
    int i, j;

    for(i = 0; i < 3; ++i)
        scanf("%s", die[i]);

    int value = 0;

    for(i = 0; i < 3; ++i){
        for(j = 0; j < 3; ++j){
            if(die[i][j] == 'o')
                ++value;
        }
    }

    switch(value){
        case 1:
            if(die[1][1] == 'o')
                printf("1\n");
            else
                printf("unknown\n");
            break;
        case 2:
            if((die[0][0] == 'o' && die[2][2] == 'o') || (die[2][0] == 'o' && die[0][2] == 'o'))
                printf("2\n");
            else
                printf("unknown\n");
            break;
        case 3:
            if((die[0][2] == 'o' && die[1][1] == 'o' && die[2][0] == 'o') || (die[0][0] == 'o' && die[1][1] == 'o' && die[2][2] == 'o'))
                printf("3\n");
            else
                printf("unknown\n");
            break;
        case 4:
            if(die[0][0] == 'o' && die[0][2] == 'o' && die[2][0] == 'o' && die[2][2] == 'o')
                printf("4\n");
            else
                printf("unknown\n");
            break;
        case 5:
            if(die[0][0] == 'o' && die[0][2] == 'o' && die[1][1] == 'o' && die[2][0] == 'o' && die[2][2] == 'o')
                printf("5\n");
            else
                printf("unknown\n");
            break;
        case 6:
            if((die[0][0] == 'o' && die[0][1] == 'o' && die[0][2] == 'o' && die[2][0] == 'o' && die[2][1] == 'o' && die[2][2] == 'o') || (die[0][0] =='o' && die[1][0] == 'o' && die[2][0] == 'o' && die[0][2] == 'o' && die[1][2] == 'o' && die[2][2] =='o'))
                printf("6\n");
            else
                printf("unknown\n");
            break;
        default:
            break;
    }

    return 0;
}