package main

import (
	"fmt"
)

func main() {
	var mark [4]bool
	var N, M int
	fmt.Scan(&N, &M)
	mark[N] = true
	var P, Q int
	for i := 0; i < M; i++ {
		fmt.Scan(&P, &Q)
		mark[P], mark[Q] = mark[Q], mark[P]
	}
	for i, v := range mark {
		if v {
			fmt.Println(i)
		}
	}
}