import sequtils,unicode
proc getchar_unlocked():char {. importc:"getchar_unlocked",header: "<stdio.h>" .}

var C = [20104, 20063, 19892, 20011, 19874, 20199, 19898, 20163, 19956, 19841]
block:
  let k = getchar_unlocked()
  C[k.ord - '0'.ord] -= 1
  discard getchar_unlocked()
while true:
  let k = getchar_unlocked()
  if k < '0':
    for i in 0..<10:
      if C[i] == -1 : stdout.write i
    stdout.write " "
    for i in 0..<10:
      if C[i] == 1 : echo i
    quit(0)
  C[k.ord - '0'.ord] -= 1