#include <bits/stdc++.h>
using namespace std;
int main(){
	int n,i,g,s,b,q,m;
	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&&b-s==s-g) cout<<i<<endl;
	} 
	return 0;
	}

/**************************************************************
	Problem: 1466
	User: ljl2
	Language: C++
	Result: Wrong Answer
****************************************************************/