#include<stdio.h>
#define  N 2000000
#define INF -2100000000

int h,a[N+1];

void maxHeapify(int);
int extract(void);
void increasekey(int, int);
void insert(int);

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

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

void maxHeapify(int i){
  int l,r,largest,temp;
  
  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){
    temp = a[i];
    a[i] = a[largest];
    a[largest] = temp;
    maxHeapify(largest);
  }
}

int extract(){
  int max;
  if(h < 1) return INF;
  max = a[1];
  a[1] = a[h--];
  maxHeapify(1);
  return max;
}

void increasekey(int i,int key){
  int temp;
  
  if(key < a[i]) return;
  a[i] = key;
  
  while(i > 1 && a[i/2] < a[i]){
    temp = a[i];
    a[i] = a[i/2];
    a[i/2] = temp;
    i = i/2;
  }
}

void insert(int key){
  h++;
  a[h] = INF;
  increasekey(h, key);
}
