package main

import . "fmt"

func main() {
	var n int
	Scan(&n)
	a:=make([]string,n)
	for i:=range a {
		Scan(&a[i])
	}
	for _,s:=range a {
		var b string
		Scan(&b)
		if s!=b {
			Println(s)
			Println(b)
		}
	}
}