#include <iostream>
using namespace std;


#include <string>

int main() {

    string sentence="Lawrence will go";
    string place=" to the store.";

    cout << "The sentence is " << sentence.length() << " characters long." << endl;
    cout << sentence << endl;

    cout << "Append: " << place << " " << " to: " << sentence << endl;
    sentence.append(place);


    cout << "The sentence is " << sentence.length() << " characters long." << endl;
    cout << sentence << endl;

    int pos=sentence.find("go");
    sentence.insert(pos,"not ");
    cout << "The sentence is " << sentence.length() << " characters long." << endl;
    cout << sentence << endl;

}