N=gets.chomp.to_i
G=[]
for num in 1..N
  (a,b,c,d,r) = gets.chomp.split
  a = a.to_i
  b = b.to_i
  c = c.to_i
  d = d.to_i
  G[num-1] = []
  G[num-1][0] = a
  G[num-1][1] = b
  G[num-1][2] = c
  G[num-1][3] = d
  G[num-1][4] = r
end

guess_have = {}
guess_not = {}

is_first = true
for num in 1..N
  if G[num-1][4] == 'NO'
    for i in 0..3
      guess_not[G[num-1][i]] = 1
    end
  end

  if G[num-1][4] == 'YES'
    for i in 0..3
      str = G[num-1][i]
      if is_first
        guess_have[str] = true
      else
        if not guess_have.key?(str)
          guess_have.delete(str)
        end

        # found = false
        # guess_have.each_pair do |x,y|
        #   if str == x
        #     found = true
        #   end
        # end

        # if not found
        #   guess_have.delete(str)
        # end
      end
    end

    guess_have.each_pair do |x, y|
      found = false
      for i in 0..3
        if G[num-1][i] == x
          found = true
        end
      end
      if not found
        # puts 'guess' + x.to_s
        guess_have.delete(x)
      end
    end
    is_first = false
  end
end

def guess(gh, gn)
  # puts gn.length
  gh.each_pair do |x, v|
    # puts x
  end
  # puts gh.length
  if gn.length == 9
    ret = ""
    for n in 0..9
      if not gn.key?(n)
        ret = n
      end
    end
    return ret
  end

  gh.each_pair do |x, y|
    if gn.key?(x)
      gh.delete(x)
    end
  end

  gh.each_pair do |x, y|
    return x
  end
end
puts guess(guess_have, guess_not)