#!/usr/bin/env python3
customers = [ [] for _ in range(20) ]
for _ in range(int(input())):
    query = input().split()
    typ = int(query[0])
    if typ == 0:
        _, n, m, *a = query
        customers[int(n) - 1] = list(a)
    elif typ == 1:
        b = query[1]
        for i, lst in enumerate(customers):
            if b in lst:
                lst.remove(b)
                print(i + 1)
                break
        else:
            print(-1)
    elif typ == 2:
        c = int(query[1]) - 1
        customers[c] = []