#include "iostream" using namespace std; int main(){ int a,b,s[1000005],ans=0,i=0; cin>>a>>b; while(a<=b){ if(a%7==0){ ans++; s[i]=a; i++; } else { int k=a; while(k){ if(k%10==7){ ans++; s[i]=a; i++; break; } k/=10; } } a++; } cout<<ans<<"\n"; for(int j=0;j<i;j++){ cout<<s[j]<<"\n"; } return 0; }