Decompression (w/ sstream) C++

#include <iostream>
#include <sstream>

int main()
{
    using namespace std;

    string text;
    getline(cin, text);

    ostringstream out;
    int num = 0;
    char ch;
    while (!text.empty())
    {
        istringstream iss(text);
        iss >> num;
        iss.clear();
        iss.get(ch);
        if (num)
        {
            while (num--)
                out << ch;
            num = 0;
        }
        else
            out << ch;
        getline(iss, text);
    }

    cout << out.str() << endl;

    return 0;
}