import sys
input = sys.stdin.readline
from heapq import *

Q, K = map(int, input().split())
H1, H2 = [], []
cnt = 0
for _ in range(Q):
    query = list(map(int, input().split()))
    if query[0] == 1:
        v = query[1]
        if cnt < K:
            heappush(H1, -v)
            cnt += 1
        else:
            maxv = -heappop(H1)
            if v <= maxv:
                heappush(H1, -v)
                heappush(H2, maxv)
            else:
                heappush(H1, -maxv)
                heappush(H2, v)
    else:
        if cnt < K:
            print(-1)
        else:
            print(-heappop(H1))
            if H2:
                minv = heappop(H2)
                heappush(H1, -minv)
            else:
                cnt -= 1