#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<int, int> P;
typedef vector<int> VI;
typedef vector<VI> VVI;
const ll MOD = 1000000007;
const ll INF = (1LL << 30);
const ll LINF = (1LL << 62);
#define REP(i, n) for(int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()

int main() {
	int n; cin >> n;
	vector<string> k(0);
	string a, b;
	REP(i, n) {
		cin >> a >> b;
		REP(j, k.size()) {
			if (a == k[j])
				k.erase(k.begin() + j);
		}
		k.push_back(b);
	}
	REP(i, k.size()) cout << k[i] << endl;
	return 0;
}