#include<bits/stdc++.h>
using namespace std;
int m,n,i,a,b,c,d;
int main(){
	cin>>m>>n;
	for(i=m;i<=n;i++){
		a=i%10;
		b=i/10%10;
		c=i/100%10;
		d=i/1000;
		if(i>=1000){
			if(a-b==b-c&&b-c==c-d) cout<<i<<endl;
		}else{
			if(a-b==b-c) cout<<i<<endl;
		}
	}
	return 0;
}
/**************************************************************
	Problem: 1466
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/