N = int(input())
lsD = [[] for i in range(20)]
ans = []
for i in range(N):
    ls = input().split()
    if ls[0] == '0':
        n = int(ls[1])-1
        m = int(ls[2])
        lsD[n] = ls[3:]
    elif ls[0] == '1':
        b = ls[1]
        f = False
        for i in range(20):
            for neta in lsD[i]:
                if b == neta:
                    lsD[i].remove(b)
                    f = True
                    ans.append(i+1)
                    break
            if f:
                break
        if f == False:
            ans.append(-1)
    else:
        c = int(ls[1])-1
        lsD[c] = []
print(*ans,sep='\n')