What will be the output of the following C++ code?

#include <iostream>
#include <set>
using namespace std;
int main ()
{
    set<int> myset;
    myset.insert(20);
    myset.insert(30);
    myset.insert(10);
    while (!myset.empty())
    {
        cout << ' ' << *myset.begin();
        myset.erase(myset.begin());
    }
    cout << '\n';
    return 0;
}