#include <iostream>
#define SIZE 80
using namespace std;

int main()
{
    char str[SIZE];
    cout << "Input string: ";
    cin.getline(str, SIZE);

    int i = 0;
    while (str[i] != '\0') {
        if (str[i] == ' ') {
            str[i] = '\t';
        }
        ++i;
    }

    cout << "Modified string: " << str << endl;
    system("pause");
}