#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<limits.h>
#define MAX 500001

int size;
void  heapIncreaceKey();

int Parent(int i){
  return i/2;
}

int Left(int i){
  return 2*i;
}

int Right(int i){
  return (2*i)+1;
}

void maxHeapify(int A[],int id){
  int l = Left(id);
  int r = Right(id);
  int largest,temp;

  if(l<=size && A[l]>A[id]) largest = l;
  else largest = id;

  if(r<=size && A[r]>A[largest]) largest = r;

  if(largest!=id){
    temp = A[id];
    A[id] = A[largest];
    A[largest] = temp;
    maxHeapify(A,largest);
  }
}

void builtMaxHeap(int A[]){
  int i;
  for(i=size/2 ; i>0 ; i--){
    maxHeapify(A,i);
  }
}

void maxHeapInsert(int A[],int key){
  size = size+1;
  A[size] = INT_MIN;
  heapIncreaceKey(A,size,key);
}

void heapIncreaceKey(int A[],int i,int key){
  int temp;
  if(key < A[i]) exit(1);

  A[i] = key;
  while(i>1 && A[Parent(i)]<A[i]){
    temp = A[i];
    A[i] = A[Parent(i)];
    A[Parent(i)] = temp;
    i = Parent(i);
  }
}

int heapExtractMax(int A[]){
  int max;
  if(size<1) exit(2);

  max = A[1];
  A[1] = A[size];
  size = size-1;
  maxHeapify(A,1);
  return max;
}


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