How do I ignore spaces when counting characters?

[JoshuaStudent]

Write your question here.
I'm writing a program to count the characters of the last word in a string of input, but excluding the spaces. I've written a program that can count characters, but now I need help ignoring the spaces when counting the characters.

  #include <iostream> 
#include <string> 

using namespace std; 

class CIS14 {
public:
   int countLastWordLength(const string str);
   
};

int main() 
{ 
string mystring; 
cout << "type in the word to count"; 
cout << endl; 
getline(cin, mystring); 
cout << mystring << " - "; 
cout << mystring.length(); 
cout << " characters"; 
cout << endl; 
 
return 0; 
}

[naraku9333]

getline(cin, mystring); 
cout << mystring << " - "; 
std::string t = mystring;
t.erase(std::remove_if(t.begin(), t.end(), isspace), t.end());
cout << t.length(); 
cout << " characters"; 

Or even better std::count_if(mystring.begin(), mystring.end(), [](char c) {return !isspace(c); })