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

#define MAX 2000000
#define INFTY INT_MAX

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 temp;

  temp = *a;
  *a = *b;
  *b = temp;

}

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);
}
