#include <bits/stdc++.h>
using namespace std;
int main(){
	int i,m,n,g,s,b,q;
	cin>>m>>n;
	for(i = m;i <= n;i++){
		q = i / 1000;
		b = i / 100 % 10;
		s = i / 10 % 10;
		g = i % 10;
		
		if(i >= 1000 && q - b == b - s && b - s == s - g){
			cout<<i<<endl;
		}else if(i >= 100 && i <= 999 && b - s == s - g){
			cout<<i<<endl;
		}
	}
}
/**************************************************************
	Problem: 1466
	User: admin
	Language: C++
	Result: Accepted
	Time:18 ms
	Memory:2072 kb
****************************************************************/