import sys

sys.setrecursionlimit(10**6)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.buffer.readline())
def FI(): return float(sys.stdin.buffer.readline())
def MI(): return map(int, sys.stdin.buffer.readline().split())
def MF(): return map(float, sys.stdin.buffer.readline().split())
def MI1(): return map(int1, sys.stdin.buffer.readline().split())
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def LI1(): return list(map(int1, sys.stdin.buffer.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def BI(): return sys.stdin.buffer.readline().rstrip()
def SI(): return sys.stdin.buffer.readline().rstrip().decode()
dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
inf = 10**16
# md = 998244353
md = 10**9+7

from collections import defaultdict
from heapq import *

n=II()

wait=defaultdict(list)
fin=set()
itoseat={}
seattoi={}
for i in range(n):
    data=SI().split()
    if data[0]=="0":
        seat=int(data[1])
        seattoi[seat]=i
        # itoseat[i]=seat
        for a in data[3:]:
            heappush(wait[a],(seat,i))
    elif data[0]=="1":
        a=data[1]
        while wait[a]:
            seat,i=heappop(wait[a])
            if i in fin:continue
            print(seat)
            break
        else:
            print(-1)
    else:
        seat=int(data[1])
        fin.add(seattoi[seat])