import sys
from collections import Counter

def input(): return sys.stdin.readline().strip()
def list2d(a, b, c): return [[c] * b for i in range(a)]
def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)]
def list4d(a, b, c, d, e): return [[[[e] * d for j in range(c)] for j in range(b)] for i in range(a)]
def ceil(x, y=1): return int(-(-x // y))
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)]
def Yes(): print('Yes')
def No(): print('No')
def YES(): print('YES')
def NO(): print('NO')
sys.setrecursionlimit(10 ** 9)
INF = 10 ** 18
MOD = 10 ** 9 + 7
EPS = 10 ** -10

Q = INT()

M = 20
C = [Counter() for i in range(M)]
for _ in range(Q):
    q, *arg = input().split()
    if q == '0':
        n, m, *li = arg
        n = int(n) - 1
        C[n] = Counter(li)
    elif q == '1':
        s = arg[0]
        for i in range(M):
            if C[i][s]:
                C[i][s] -= 1
                print(i+1)
                break
        else:
            print(-1)
    else:
        n = int(arg[0]) - 1
        C[n].clear()