#include<bits/stdc++.h> using namespace std; int a,b,i,k=0,a1,a2; int main(){ cin>>a>>b; for(i=a;i<b;++i){ if(i>=10&&i<=99) { a1=i%10; a2=(i-a1)/10; } if(i%7==0 || a1==7 ||a2==7)k+=1; } cout<<k<<endl; for(i=a;i<b;++i){ if(i>=10&&i<=99) { a1=i%10; a2=(i-a1)/10; } if(i%7==0 || a1==7 ||a2==7)cout<<i<<endl; } }