Why c++ .find() method is not working properly?

I am writing a code to determine how many characters in string s are also in j

Here is my code:

string j,s;
cin >> j >>s;
int count=0;

for(int i=0;i<j.size();++i){
    if(s.find(j[i])){
        ++count;
    }
}
cout << count+1 << endl;

The problem is that s.find is not work for j[0] and
When a user enters none as string s it perceives it to be the keyword none.

How can I fix this?
I am using clang 13.0.0
GNU nano 6.0 as my editor

>Solution :

string::find does not return a boolean, but the position of the matching character (from 0 to size()-1) or string::npos if it doesn’t find anything.

https://en.cppreference.com/w/cpp/string/basic_string/find

Use if(s.find(j[i]) != std::string::npos) instead.