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

typedef long long int int64;
typedef int64 node;

typedef struct pairingHeapNode{
  node val;
  struct pairingHeapNode *next;
  struct pairingHeapNode *child;
} heapNode;

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

heapNode* newHeapNode(node *v){
  heapNode *res=(heapNode *)malloc(sizeof(heapNode));
  res->val=*v;
  res->next=NULL;
  res->child=NULL;
  return res;
}

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

heapNode* merge(heapNode *a,heapNode *b,int (*cmp)(const node *a,const node *b)){
  if(a==NULL) return b;
  if(b==NULL) return a;
  if(cmp(&a->val,&b->val)){
    b->next=a->child;
    a->child=b;
    return a;
  } else {
    a->next=b->child;
    b->child=a;
    return b;
  }
}

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

void pop(heap *h,node *v){
  *v=h->root->val;
  heapNode *lst=h->root->child;
  int (*cmp)(const node *a,const node *b)=h->cmp;
  free(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=merge(r,merge(a,b,cmp),cmp);
    lst=next;
  }
  if(lst!=NULL){
    r=merge(r,lst,cmp);
  }
  h->root=r;
  return;
}

int cmpMin(const node *a,const node *b){
  return *a<=*b;
}

int cmpMax(const node *a,const node *b){
  return !cmpMin(a,b);
}

void run(void){
  int q,k;
  scanf("%d%d",&q,&k);
  heap *maxHeap=newHeap(cmpMax);
  heap *minHeap=newHeap(cmpMin);
  while(q--){
    int c;
    scanf("%d",&c);
    if(c==1){
      int64 v;
      scanf("%lld",&v);
      push(maxHeap,&v);
      if(maxHeap->heapSize>k){
	pop(maxHeap,&v);
	push(minHeap,&v);
      }
    } else if(maxHeap->heapSize<k){
      printf("-1\n");
    } else {
      int64 v;
      pop(maxHeap,&v);
      printf("%lld\n",v);
      if(minHeap->heapSize>0){
	pop(minHeap,&v);
	push(maxHeap,&v);
      }
    }
  }
  return;
}

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