N = int(input())
AB = [input().split() for i in range(N)]

cands = []
fails = set()
for a,b in AB:
    fails.add(a)
    cands.append(b)

ans = []
for c in cands:
    if c in fails: continue
    ans.append(c)
    fails.add(c)
print(*ans, sep='\n')