import sys
from collections import defaultdict
input = sys.stdin.readline

N = int(input())
ok = defaultdict(int)
B = []
for _ in range(N):
    a, b = input().split()
    ok[a] = -1
    if ok[b] == 0:
        ok[b] = 1
    B.append(b)

for b in B:
    if ok[b] == 1:
        print(b)
        ok[b] = 0