package main

import "fmt"

func main() {
	var N int
	fmt.Scan(&N)
	A := make([][]int, N)
	R := make([]int, 0)
	for i := 0; i < N; i++ {
		var n int
		fmt.Scan(&n)
		A[i] = make([]int, n)
		for j := 0; j < n; j++ {
			fmt.Scan(&A[i][j])
		}
	}
	// fmt.Println("A", A)
	for i := 0; i < 100; i++ { // 列
		for j := 0; j < N; j++ { // 行
			if i < len(A[j]) {
				R = append(R, A[j][i])
			}
		}
	}
	for _, v := range R {
		fmt.Print(v, " ")
	}
	fmt.Println()
}