import sequtils, strutils

let n = parseInt readLine stdin

var nums = (0..9).toSeq

for _ in 0..<n:
  let
    xs = stdin.readLine.split
    prediction = xs[0..3].map parseInt
    r = xs[4]

  if r == "YES":
    nums.keepItIf it in prediction
  if r == "NO":
    nums.keepItIf it notin prediction

echo nums[0]