#include<stdio.h>
#define MAX 2000000000
#define INFTY (1<<30)




void maxHeap(int);
void insert(int);
void increaseK(int, int);
int heapExtractMax(void);

int H, A[MAX];




void maxHeap(int i){
  int l, r, large,k;
  l = 2*i;
  r = 2*i+1;
  if( l <= H && A[l] > A[i] ) large = l;
  else large = i;
  if( r <= H && A[r] > A[large] ) large = r;
  if( large != i){
    k = A[i];
    A[i] = A[large];
    A[large] = k;
    maxHeap(large);
  }
}

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

void increaseK(int i, int key){
  int c;
  if(key < A[i]) return;
  A[i] = key;
  while (i > 1 && A[i/2] < A[i]) {
    c = A[i/2];
    A[i/2] = A[i];
    A[i] = c;
    i = i/2;
  }
}




int heapExtractMax(){
  int max;
  if( H < 1 ) return -INFTY;
  max = A[1];
  A[1] = A[H];
  H--;
  maxHeap(1);
  return max;
}

int main(){
  int key;
  A[H] = -INFTY;
  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", heapExtractMax());
    }
  }

  return 0;
}

