#include"bits/stdc++.h" using namespace std; int main(){ int a,b,ans=0; cin>>a>>b; for(int i=a;i<=b;i++){ int t=i; if(t%7==0){ ans++; i+=1; } int s=i; while(s){ if(s%10==7)ans++; s/=10; } } cout<<ans<<'\n'; for(int i=a;i<=b;i++){ int t=i; if(t%7==0){ cout<<i<<'\n'; i+=1; } int s=i; while(s){ if(s%10==7)cout<<i<<'\n'; s/=10; } } }