import strutils, sequtils

let n = parseInt(readLine(stdin))

var exists: array[10, bool]
for i in 0..9: exists[i] = true

for i in 0..<n:
  let
    tokens = readLine(stdin).split()
    nums = map(tokens[0..3], proc(x: string): int = parseInt(x))
    (a, b, c, d) = (nums[0], nums[1], nums[2], nums[3])
    r = tokens[4]

  if r == "YES":
    for d in {0..9} - {a,b,c,d}: exists[d] = false
  else:
    for d in {a,b,c,d}: exists[d] = false

for d in 0..9:
  if exists[d]: echo d