#include<bits/stdc++.h> using namespace std; int a,b,i,k=0,a1,a2,a3,a4; int main(){ cin>>a>>b; for(i=a;i<=b;++i){ if(i>=1000&&i<=9999) { a1=i%100%10; a2=(i-a1)%100/10; a3=(i-a2-a1)%1000/100; a4=(i-a1-a2-a3)/1000; } if(i%7==0 || a1==7 ||a2==7 || a3==7)k+=1; } cout<<k<<endl; for(i=a;i<=b;++i){ if(i>=1000&&i<=9999) { a1=i%100%10; a2=(i-a1)%100/10; a3=(i-a2-a1)%1000/100; a4=(i-a1-a2-a3)/1000; } if(i%7==0 || a1==7 ||a2==7 ||a3==7)cout<<i<<endl; } }