Write a function sum$\_$column$($grid$,$ offset$)$ that takes as arguments a grid of numbers and an offset and returns the result of summing the numbers on a specified column of grid. A grid is represented as a list of lists, as shown on the right, and offset $0$ refers to the leftmost column $($in the example shown: $11,66,22,77,33).$ You can assume that the argument grid is in fact a grid $($i$.$e$.,$ a list of equal$-$length lists of numbers$).$