func main()
	var n: int :: cui@inputInt()
	var a: [][]int :: #[1000, 100]int
	for i(0, n - 1)
		var p: int :: cui@inputInt()
		for j(0, p - 1)
			do a[i][j] :: cui@inputInt()
		end for
	end for
	
	for j(0, 99)
		for i(0, n - 1)
			if(a[i][j] = 0)
				skip i
			end if
			do cui@print("\{a[i][j]} ")
		end for
	end for
	var ans: int :: 0
end func