Swap values

You are given two variables $a$ and $b$. Swap their values so that $a$ holds the value of $b$ and $b$ holds the value of $a$. Then print $a$ and $b$ in this order.

A single line with two integers $a$ and $b$ ($|a|, |b| \le 10^9$).

A single line with $a$ and $b$ after the swap.

Writing a = b; b = a; leaves $b$ in both variables: the old value of $a$ is lost on the first line. Save it in a helper variable first: t = a; a = b; b = t;. In Python and Go a, b = b, a works too.