#include<stdio.h>
#include<string>

int i,j,b;
char s[100][100];

int main()
{
    for(i=0;i<5;++i)
    scanf("%s", s[i]);
    
    for(i=0;i<5;++i)
    for(j=0;j<5;++j)
    if(s[i][j] == 'F' && s[i][j+1] == 'B' && s[i][j+2] == 'I' ) {printf("%d\n", i+1); b=b+1;}
    
    
    if (b==0) printf("UTEKO");
    
  
       
  
    

    
    return 0;
}