#include <stdio.h>
#define mark -10
int H;
int s[2000000];

void maxheapfy(int i){
     int left = 2*i;
    int right = 2*i +1;
    int largest;
    if(s[i]<s[right] && right<=H) largest = right;
    else largest = i;
    if(s[left]>s[largest] && left<=H ) largest = left;
    
    if(largest != i){
        int tmp = s[largest];
        s[largest] = s[i];
        s[i] = tmp;
        maxheapfy(largest);
    }
    
}

void increasekey(int i,int key){
    if(key<s[i])return;
    s[i] = key;
    while(i>1 && s[i/2]<s[i] ){
        int tmp = s[i];
        s[i] = s[i/2];
        s[i/2] = tmp;
        i = i/2;
    }
    
}
void insert(int a){
    H++;
    s[H] = mark;
    increasekey(H,a);
}

int extract(){
    int maxkey;
    if(H<1)return mark;
    maxkey = s[1];
    s[1] = s[H--];
    maxheapfy(1);
    return maxkey;
    
}
int main(){
    // Your code here!
    int i,k;
    char com[20];
    

   while(1){
        scanf("%s",com);
        if(com[0]=='i'){scanf("%d",&k);
            insert(k);
        }
        if(com[1]=='x'){
        int ex =    extract();
        printf("%d\n",ex);
        }
        if(com[2]=='d'){
            
            break;
        }
        
    }
 
    
}
