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#include <string>
#include <sstream>
...
    cout << "in='" << s << "' " << "out='" << sret << "'" << endl;
    return 0;
}

#include <string>
#include <sstream>
...
    cout << "in='" << s << "' " << "out='" << sret << "'" << endl;
    return 0;
}