#include<stdio.h>
#include<string.h>
#define MAX 2000000
#define INFTY (1<<30)

void swap(int *,int *);
void maxHeapify(int);
int extract();
void increaseKey(int,int);
void insert(int);

int H,A[MAX+1];

int main(){
  int key;
  char com[10];

  while(1){
    scanf("%s",com);
    if(com[0]=='e' && com[1]=='n')break;
    if(com[0]=='i'){
      scanf("%d",&key);
      insert(key);
    }else{
      printf("%d\n",extract());
    }
  }
  return 0;
}
void swap(int *a,int *b){
  int tmp;
  tmp=*a;
  *a=*b;
  *b = tmp;

}

void maxHeapify(int i){
  int l,r,largest;
  l=2*i;
  r=2*i+1;

  if(l <= H && A[l] > A[i])largest=l;
  else largest=i;
  if(r<=H && A[r] > A[largest])largest=r;
  if(largest!=i){
    swap(&A[i],&A[largest]);
    maxHeapify(largest);
  }
}
int extract(){
  int maxv;
  if(H<1)return -INFTY;
  maxv=A[1];
  A[1]=A[H--];
  maxHeapify(1);
  return maxv;
}
void increaseKey(int i,int key){
  if(key<A[i])return;
  A[i]=key;
  while(i>1 && A[i/2]<A[i]){
    swap(&A[i],&A[i/2]);
    i=i/2;
  }
}

void insert(int key){
  H++;
  A[H]=-INFTY;
  increaseKey(H,key);
}

















































