#include<stdio.h>
int main()
{
int i,j,ocka=0;
char a[3][4];
for (i=0;i<3;i++)
      for (j=0;j<=3;j++)  {scanf("%c",&a[i][j]);if (a[i][j]=='o') ocka++;}


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


default: {printf("unknown\n");break;}
}


return 0;
}