from collections import defaultdict
from heapq import heappush, heappop
from sys import stdin, stdout
input = lambda: stdin.readline().rstrip()
write = stdout.write

def main():
    N = int(input())
    U = [tuple(input().split()) for _ in [0] * N]

    sushi = defaultdict(list)
    seat = [[] for _ in [0] * 21]
    for s in U:
        if s[0] == '0':
            i = int(s[1])
            for t in s[3:]:
                heappush(sushi[t], i)
                seat[i].append(t)
        elif s[0] == '1':
            while sushi[s[1]]:
                i = heappop(sushi[s[1]])
                if s[1] in seat[i]:
                    print(i)
                    break
            else:
                print(-1)
        else:
            seat[int(s[1])] = []

main()