#include<stdio.h>
#include<string.h>
#define N 500001
#define INF 1000000000

int parent(int);
int left(int);
int right(int);
void Insert(int);
int ExtraMax(void);
void Maxheap(int);
void Increasekey(int,int);

int H=0,S[N];

int main(){
  int key;
  char ch[20];
  while(1){
    scanf("%s",ch);
    if(ch[0]=='i'){
      scanf("%d",&key);
      Insert(key);
    }
    else if(ch[0]=='e' && ch[1]=='x'){
      printf("\n%d",ExtraMax());
    }
    else
      break;
  }
  return 0;
}
int parent(int i){
  return i/2;
}
int left(int i){
  return 2*i;
}
int right(int i){
  return 2*i+1;
}
void Insert(int key){
  H++;
  S[H]=-INF;
  Increasekey(H,key);
}
int ExtraMax(){
  int max;
  max=S[1];
  S[1]=S[H];
  H--;
  Maxheap(1);
  return max;
}
void Maxheap(int i){
  int l,r,large,tmp;
  l=left(i);
  r=right(i);
  if(l<=H && S[l]>S[i])
    large=l;
  else large=i;
  if(r<=H && S[r]>S[large])
    large=r;

  if(large!=i){
    tmp=S[i];
    S[i]=S[large];
    S[large]=tmp;
    Maxheap(large);
  }
}
void Increasekey(int i,int key){
  int tmp;
  S[i]=key;
  while(i>1 && S[parent(i)]<S[i]){
    tmp=S[parent(i)];
    S[parent(i)]=S[i];
    S[i]=tmp;
    i=parent(i);
  }
}