#include<bits/stdc++.h>
using namespace std;
int main()//0000
{
    int m,n;
    cin>>m>>n;
    for(;m<=n;m++){
    if(m>999){
            if((m%100/10)-(m%10)==(m%1000/100)-(m%100/10)&&(m%1000/100)-(m%100/10)==(m/1000)-(m%1000/100)){
            cout<<m<<endl;
        }
    }else if((m%100/10)-(m%10)==(m%1000/100)-(m%100/10)){
        cout<<m<<endl;
    }   
}
}
/**************************************************************
	Problem: 1466
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/