from collections import defaultdict
from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    N = int(input())
    AB = [tuple(input().split()) for _ in [0] * N]

    student = defaultdict(int)
    for a, b in AB:
        student[a] = -1
    ans = []
    for a, b in AB:
        if not student[b]:
            ans.append(b)
            student[b] = 1
    print(*ans, sep='\n')


main()