S = gets.chomp
M = S.size
i = (0...M).find {|i| (0..2).all? {|j| S[i + j] == 'O'}} || M
j = (0...M).find {|i| (0..2).all? {|j| S[i + j] == 'X'}} || M
ans = if i < j
        "East"
      elsif j < i
        "West"
      else
        "NA"
      end
puts ans