#yuki649
import heapq


q,k=map(int,raw_input().split())
que1=[]
que2=[]
print '--------------'
for i in xrange(q):
 s=map(int,raw_input().split())
 if len(s)==2:
  v=s[1]
  if len(que1)<k:
   heapq.heappush(que1,-v)
  elif v<-que1[0]:
   heapq.heappush(que2,-heapq.heappushpop(que1,-v))
  else:
   heapq.heappush(que2,v)
 else:
  if len(que1)<k:
   print '-1'
  elif que2:
   print -heapq.heapreplace(que1,-heapq.heappop(que2))
  else:
   print -heapq.heappop(que1)