import algorithm, sequtils, strutils
let
  n: int = stdin.readline.parseInt
  a: seq[seq[int]] = mapIt(0..<n, stdin.readline.split.map(parseInt))
var
  b: seq[seq[int]] = newSeqwith(n, newSeq[int](10000))
  ans: seq[int]
for i in 0..<n:
  for j in 1..<a[i].len:
    b[i][j - 1] = a[i][j]
for i in 0..<10000:
  var tmp: seq[int]
  for j in 0..<n:
    if b[j][i] != 0:
      tmp.add(b[j][i])
  tmp.sort()
  ans.add(tmp)
for i in ans:
  stdout.write(i)
  stdout.write(' ')
echo ""