N = gets.to_i
A, B, C, D, R = (1..N).map {
  a, b, c, d, r = gets.split
  [*[a, b, c, d].map(&:to_i), r]
}.transpose
ans = (0..9).find {|n|
  A.zip(B, C, D, R).all? {|a, b, c, d, r|
    if r == "YES"
      [a, b, c, d].include?(n)
    else
      not [a, b, c, d].include?(n)
    end
  }
}
puts ans