$568844\mathrm{.}4228274.qx3zgy7$

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Integer grid$\_$size is read from input, representing the number of rows and columns of a two$-$dimensional list. Two$-$dimensional list

pattern$\_$grid is created with minus signs, $\text{'}-\text{'},$ as the initial values. For each element at row index $m$ and column index $n$ of

pattern$\_$grid, if the sum of $m$ and $n$ is odd, assign the element with $\text{'}x\text{'}.$

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Note: $(m+n)\%2==0$ returns False if $m+n$ is odd.