include <iostream>

using namespace std; int main() { string s; int L,R; cin>>s>>L>>R; L--; R--; int n=R-L+1; cout<<n+1<<endl; string t=s.substr(L,n); for(int i=1; i<n; i++) cout<<t.substr(0,i)<<endl; } //14881488148814881488148814881488148814881488148814881488148814881488