#include <iostream>
#include <string>
#include <cctype>

using std::cout;
using std::endl;
using std::string;

int main()
{
    string s1("Hi I'm ....Greg.");

    cout << s1 << endl;

    for(char &c : s1){
        if(ispunct(c)){
            c = '\0';
        }
    }

    cout << s1 << endl;

    return 0;
}