perfectNumber

#include<iostream>
using namespace std;

int divisor(int n){
    int sum = 0;
    for(int i = 1; i < n; i++){
        if(n%i==0) sum += i;
    }
    if(sum == n) return 1;
    else return 0;
}

main(){
    int a, b, check = 0;
    cin>>a>>b;
    for(int i = a; i <= b; i++){
        if(divisor(i)) {
            check = 1;
            cout<<i<<' ';
        }
    }
    if(check == 0) cout<<"0";
}