What does this C++ snippet output?

1#include <iostream>
2int main() {
3    int a = 2, b = 5;
4    int& ra = a;
5    int& rb = b;
6    int t = ra; ra = rb; rb = t;  // swaps a and b
7    std::cout << a << " " << b << "\n";
8    return 0;
9}