#!/usr/bin/env python3


import collections


N = 20


def main():
    n = int(input())
    wishlists = [collections.Counter() for _ in range(N)]
    for _ in range(n):
        data = input().split()
        if data[0] == "0":
            table_idx = int(data[1]) - 1
            wishlist = collections.Counter(data[3:])
            wishlists[table_idx] = wishlist
        elif data[0] == "2":
            wishlists[int(data[1]) - 1] = collections.Counter()
        else:
            sushi = data[1]
            for table_idx in range(N):
                if sushi in wishlists[table_idx]:
                    print(table_idx + 1)
                    wishlists[table_idx][sushi] -= 1
                    if wishlists[table_idx][sushi] == 0:
                        del wishlists[table_idx][sushi]
                    break
            else:
                print("-1")


if __name__ == '__main__':
    main()