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

#define MAX 2000000
#define INF 200000000
int H,A[MAX+1];

void swap(int x,int y){
  int t;
  t=x;
  x=y;
  y=x;
}

void maxHeapify(int i){
  int l,r,largest,tmp;
  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 -INF;
  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]=-INF;
  increaseKey(H,key);
}

int main(){
  int key;
  char com[10];
  while(1){
    scanf("%s",com);
    if(com[0]=='e' && com[1]=='n' && com[0]=='d') break;
    if(com[0]=='i'){
      scanf("%d",&key);
      insert(key);
    }
    else printf("%d\n",extract());
  }
  return 0;
}