19.py

arr = []
for _ in range(int(input())):
    toys = input().split(", ")
    toys = toys[0].split(": ") + toys[1:]
    arr.append(set(toys[1:]))

res = []
for i in range(len(arr)):
    temp = set()
    for elem in arr[:i] + arr[i + 1:]:
        temp = temp | elem
    res += list(arr[i] - temp)

print(*sorted(res), sep="\n")