#include<stdio.h>
#include<stdlib.h>
#include<string.h>

typedef struct pairingHeapNode{
  struct pairingHeapNode *next;
  struct pairingHeapNode *child;
  unsigned char val[];
} heapNode;

typedef struct pairingHeap{
  heapNode *root;
  int heapSize;
  size_t size;
  int (*cmp)(const void *,const void *);
} heap;

heapNode* newHeapNode(const void *v,const size_t size){
  heapNode *res=(heapNode *)malloc(sizeof(heapNode)+size);
  memcpy(res->val,v,size);
  res->next=NULL;
  res->child=NULL;
  return res;
}

void freeOneNode(heapNode *t){
  free(t);
  return;
}

void freeAllNode(heapNode *t){
  if(t==NULL) return;
  freeAllNode(t->next);
  freeAllNode(t->child);
  freeOneNode(t);
  return;
}

heap* newHeap(const size_t size,int (*cmp)(const void *,const void *)){
  heap *res=(heap *)malloc(sizeof(heap));
  res->root=NULL;
  res->heapSize=0;
  res->size=size;
  res->cmp=cmp;
  return res;
}

int getSize(const heap *h){
  return h->heapSize;
}

int isEmpty(const heap *h){
  return getSize(h)==0;
}

heapNode* meld(heapNode *a,heapNode *b,int (*cmp)(const void *a,const void *b)){
  if(a==NULL) return b;
  if(b==NULL) return a;
  if(cmp(a->val,b->val)<=0){
    b->next=a->child;
    a->child=b;
    return a;
  } else {
    a->next=b->child;
    b->child=a;
    return b;
  }
}

void push(heap *h,const void *v){
  heapNode *p=newHeapNode(v,h->size);
  h->heapSize++;
  h->root=meld(h->root,p,h->cmp);
  return;
}

void pop(heap *h,void *v){
  memcpy(v,h->root->val,h->size);
  heapNode *lst=h->root->child;
  int (*cmp)(const void *a,const void *b)=h->cmp;
  freeOneNode(h->root);
  h->heapSize--;
  heapNode *r=NULL;
  while(lst!=NULL && lst->next!=NULL){
    heapNode *a=lst;
    heapNode *b=lst->next;
    heapNode *next=lst->next->next;
    a->next=b->next=NULL;
    r=meld(r,meld(a,b,cmp),cmp);
    lst=next;
  }
  if(lst!=NULL){
    r=meld(r,lst,cmp);
  }
  h->root=r;
  return;
}

typedef long long int int64;

int cmpMin(const void *a,const void *b){
  int64 p=*(int64 *)a;
  int64 q=*(int64 *)b;
  return p==q?0:p-q<0?-1:1;
}

int cmpMax(const void *a,const void *b){
  int64 p=*(int64 *)a;
  int64 q=*(int64 *)b;
  return p==q?0:p-q>0?-1:1;
}

void run(void){
  int q,k;
  scanf("%d%d",&q,&k);
  heap *small=newHeap(sizeof(int64),cmpMax);
  heap *large=newHeap(sizeof(int64),cmpMin);
  while(q--){
    int c;
    scanf("%d",&c);
    if(c==1){
      int64 v;
      scanf("%lld",&v);
      push(small,&v);
      if(getSize(small)>=k){
	pop(small,&v);
	push(large,&v);
      }
    } else if(isEmpty(large)){
      printf("-1\n");
    } else {
      int64 v;
      pop(large,&v);
      printf("%lld\n",v);
    }
  }
  return;
}

int main(void){
  run();
  return 0;
}