import sequtils, strutils, sugar

let
  n = parseInt stdin.readLine

  seq1 = newSeq.collect:
    for _ in 0 ..< n:
      stdin.readLine.split.map parseInt

  size = seq1.mapIt it[0]

var
  ans: seq[int] = @[]

for i in 1 .. size.max:
  for j in 0 ..< n:
    if i > size[j]: continue

    ans.add seq1[j][i]

echo ans.join " "