inputs = STDIN.readlines.map(&:chomp)
N = inputs[0].to_i
TRIES = inputs[1..-1].map { |line|
  t = line.split(/\s+/)
  [t[0..3].map(&:to_i), t[4] == 'YES']
}

cands = (0..9).to_a
TRIES.each do |digits, result|
  if result
    cands &= digits
  else
    cands -= digits
  end
end

puts cands.first