#include<bits/stdc++.h>
using namespace std;
int main()
{
	int m,n,g,s,b,q;
	cin>>m>>n;
	for(int i=m;i<=n;i++)
	{
		g=i%10;
		s=i/10%10;
		b=i/100%10;
		q=i/1000;
		if(i>=1000)
		{
			if(q-b==b-s&&s-g==b-s) cout<<i<<endl;
		}else if(i>=100&&i<=999&&b-s==s-g) cout<<i<<endl;
		
		
		
	}
	
	return 0;
}


/**************************************************************
	Problem: 1466
	User: lzc
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2072 kb
****************************************************************/