N = int(input())
D = [[] for i in range(20)]
for _ in range(N):
    U = list(input().split())
    if U[0] == "0":
        n, m = int(U[1]), U[2]
        D[n - 1] = U[3:]
    elif U[0] == "1":
        for i in range(20):
            if U[1] in D[i]:
                print(i + 1)
                D[i].pop(D[i].index(U[1]))
                break
        else:
            print(-1)
    else:
        D[int(U[1]) - 1] = []