func main()
	var n: int :: cui@inputInt()
	var m: int :: cui@inputInt()
	
	var cup: []bool :: #[4]bool
	do cup[n] :: true
	
	for(1, m)
		var p: int :: cui@inputInt()
		var q: int :: cui@inputInt()
		var tmp: bool :: cup[p]
		do cup[p] :: cup[q]
		do cup[q] :: tmp
	end for
	
	for i(1, 3)
		if(cup[i])
			do cui@print("\{i}\n")
		end if
	end for
end func