func main()
	var N: int :: cui@input().toInt(&)
	var B: [][]char :: #[N][]char
	var dic: dict<[]char, int> :: #dict<[]char, int>
	for i(0, N - 1)
		var ss: [][]char :: cui@input().split(" ")
		do B[i] :: ss[1]
		do dic.add(ss[0], 0)
	end for
	for i(0, N - 1)
		if(!dic.exist(B[i]))
			do cui@print(B[i] ~ "\n")
			do dic.add(B[i], 0)
		end if
	end for
end func