Calculate the Analytic Expression of a Cross-Shaped Graph

Given a cross-shaped graph (which can be regarded as the combination of the x-axis and y-axis), determine its analytic expression. Note that the set of points representing both the x-axis and y-axis can be described by the equation $$xy = 0$$ in LaTeX format.

Your task is to output this analytic expression exactly as "xy=0".

inputFormat

This problem does not require any input. You may assume an empty input.

outputFormat

Output the analytic expression of the graph. The correct output is: xy=0.

sample

dummy_input_1

xy=0