#include <bits/stdc++.h>
using namespace std;

int main()
{
  char field[8][8];

  for (int i = 0; i < 8; i++){
    for (int j = 0; j < 8; j++){
      cin >> field[i][j];
    }
  }
  
  bool judge = false;
  for (int i = 0; i < 8; i++){
    for (int j = 0; j < 8; j++){
      if (field[i][j] == '1'){
        if (field[i + 3][j] == '1'){
          cout << 'B';
        }
        else if (field[i][j + 3] == '1'){
          cout << 'C';
        }
        else if (field[i + 2][j - 1] == '1'){
          cout << 'D';
        }
        else if (field[i + 1][j + 2] == '1'){
          cout << 'E';
        }
        else if (field[i + 2][j + 1] == '1'){
          cout << 'F';
        }
        else if (field[i + 1][j - 1] == '1'){
          cout << 'G';
        }
        else {
          cout << 'A';
        }
        judge = true;
      }
      if (judge)  break;
    }
    if (judge)  break;
  }
  cout << endl;
}