#!python
# -*- coding: utf-8 -*-


def main():
    N = int(input())
    seki = [[] for i in range(20)]
    for t in range(N):
        input_list = input().split()
        if input_list[0] == '0':
            n, m = map(int, input_list[1:3])
            A = input_list[3:]
            seki[n - 1] = A
        if input_list[0] == '1':
            for i, kyaku in enumerate(seki):
                neta = input_list[1]
                if neta in kyaku:
                    kyaku.remove(neta)
                    print(i + 1)
                    break
            else:
                print(-1)
        if input_list[0] == '2':
            c = int(input_list[1])
            seki[c - 1].clear()


if __name__ == '__main__':
    main()