#include "bits/stdc++.h" using namespace std; bool v(int c){ int s=c; while(s){ if(s%10==7)return true; s/=10; } return false; } int a,b,n=0; int main(){ cin>>a>>b; for(int i=a;i<=b;i++){ if(i%7==0||v(i))n++; } cout<<n; for(int i=a;i<=b;i++){ if(i%7==0||v(i))cout<<endl<<i; } return 0; }