import sys
import heapq
input = sys.stdin.readline

Q, K = map(int, input().split())
low = []
high = []
for _ in range(Q):
    query = list(map(int, input().split()))
    if len(query) == 2:
        heapq.heappush(low, -query[1])
        if len(low) > K:
            x = -heapq.heappop(low)
            heapq.heappush(high, x)
    else:
        if len(low) < K:
            print(-1)
        else:
            print(-heapq.heappop(low))
            if high:
                x = heapq.heappop(high)
                heapq.heappush(low, -x)