/* -*- coding: utf-8 -*-
 *
 * 938.cc:  No.938 賢人を探せ - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 20000;
const int MAX_M = MAX_N * 2;

/* typedef */

typedef map<string,int> msi;

/* global variables */

msi idmap;
string ss[MAX_M];
int as[MAX_N], bs[MAX_N];
bool es[MAX_M];

/* subroutines */

inline int allocid(char s[], int &n) {
  string t(s);
  msi::iterator mit = idmap.find(t);
  if (mit != idmap.end()) return mit->second;
  ss[n] = t;
  return (idmap[t] = n++);
}

/* main */

int main() {
  int n;
  scanf("%d", &n);

  int m = 0;
  for (int i = 0; i < n; i++) {
    char s0[16], s1[16];
    scanf("%s%s", s0, s1);
    int id0 = allocid(s0, m);
    int id1 = allocid(s1, m);
    as[i] = id0, bs[i] = id1;
    es[id0] = true;
  }

  for (int i = 0; i < n; i++)
    if (! es[bs[i]]) {
      puts(ss[bs[i]].c_str());
      es[bs[i]] = true;
    }
  return 0;
}