stringstream

#include <iostream>
#include <sstream>

using namespace std;

int main(int argc, char **argv)
{
    string line;
    while (getline(cin, line))
    {
        cout << line << endl;
        string val;
        istringstream iss(line);
        while (iss >> val)
        {
            cout << "    " << val << endl;
        }
    }
    return 0;
}