#include <iostream> using namespace std; int main(){ int m, n, ge, shi, bai, qian; cin>>m>>n; for(int i=m; i<=n; i++){ ge=i%10; shi=i/10%10; bai=i/100%10; qian=i/1000%10; if(i>=100 && i<=999){ if(shi-ge==bai-shi || ge-shi==shi-bai){ cout<<i<<endl; } } if(i>=1000 && i<=9999){ if(ge-shi==shi-bai && shi-bai==bai-qian || qian-bai==bai-shi && bai-shi==shi-ge){ cout<<i<<endl; } } } return 0; }