What does this C++ snippet output?

1#include <iostream>
2int main() {
3    int x = 7;
4    const int& cr = x;
5    auto a = cr;     // copy, drops const
6    const auto& b = cr;  // alias, keeps const
7    x = 70;
8    std::cout << a << " " << b << "\n";
9    return 0;
10}