#include <iostream>
using namespace std;
int main() {
int acc=0 ;
string a , b ;
cin>>a>>b ;
if (a.size() < 8 ){
for(int i=0 ;i<a.size() ;i++ ){
if (a[i] == b[i] )
acc++;
}
cout<<acc<<endl;
if ( acc == a.size() ){
cout<<"yes";
return 0 ;
}
}
else if ( a.size() >= 8) {
if ( a.size()- b.size() == 1 || a.size() == b.size() ){
for(int j=0 ;j< a.size() ;j++ )
if (a[j] == b[j])
acc++;
}
cout<<acc<<endl;
if (acc==a.size() || acc==a.size() -1 ){
cout<<"yes"<<endl;
return 0 ;
}
}
cout<<"no "<<endl;
return 0;
}
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