C++ string search for a single letter

#include <iostream> 
#include <string> 

using namespace std; 

int main(int argc, char *argv [])
{   //from  w w w  . ja  va  2 s.  c  o m
        string myString{ "This is my string!" }; 

        found = myString.find_first_of("msg"); 
        if (found != string::npos) 
        { 
                cout << "is found at position: " << found << endl; 
        } 
        return 0; 
}