#!/usr/local/bin/ruby
# -*- coding: euc-jp -*-
while true
a=Array.new(8){Array.new(8)}
for i in 0..7
   b = gets.split("").map(&:to_i)
   for j in 0..7
      a[i][j]=b[j]
   end
end

for i in 0..7
   for j in 0..7
      if a[i][j]==1 and a[i][j+1]==1 and j <=6
         if a[i+1][j]==1 and a[i+1][j+1]==1 and i <= 6 and j <= 6
            puts "A"
         elsif a[i][j+2]==1 and a[i][j+3]==1 and j <= 4
            puts "C"
         elsif a[i+1][j+1]==1 and a[i+1][j+2]==1 and i <= 6 and j <= 5
            puts "E"
         elsif a[i+1][j-1]==1 and a[i+1][j]==1 and j >=1 and i <= 6
            puts "G"
         elsif a[i-1][j+1]==1 and a[i+1][j]==1 and i >= 1 and i <= 6 and j <= 6
            puts "D"
         elsif a[i-1][j]==1 and a[i+1][j+1]==1 and i >= 1 and i <= 6 and j <= 6
            puts "F"
         end
      end
      if a[i][j]==1 and a[i+1][j]==1 and a[i+2][j]==1 and a[i+3][j]==1 and i <= 4 
         puts "B"
      end
   end
end

end