N = int(input())
S = [[]] * 20
for _ in range(N):
    U = input().split()
    if U[0] == "0":
        S[int(U[1]) - 1] = U[3:]
    elif U[0] == "1":
        for i in range(20):
            if U[1] in S[i]:
                print(i + 1)
                S[i].pop(S[i].index(U[1]))
                break
        else:
            print(-1)
    else:
        S[int(U[1]) - 1].clear()