Xorry 1

You are given an integer $X$. Two integers ($A$, $B$) are said to be an Xorry pair, if the following conditions are satisfied: - $A \oplus B = X$ - $0 \leq A \leq B \leq X$ - Among all the pairs which satisfy the above two conditions, $(B - A)$ is as small as possible For example, suppose $X = 6$.\ Then, the pair $(0, 6)$ satisfies the first two conditions. But, the pair $(2, 4)$ also satisfies