римская 3 строки

#include <iostream>
#include <string>
using namespace std;




void main()
{
    string str;
    cout << "Enter the string: ";
    getline(cin, str);
    for (int i = 0; i < str.size(); i++) {
        if (isupper(str[i]) && ((i == 0) || (str[i - 1] == ' ')))
        {
            int k = i;
            while ((str[i] != ' ') && (str[i] != '\0')) i++;
            str.erase(k, (i - k));
            i = k;


        }
    }
    cout << str << endl;

    system("pause");
}