Write a MATLAB script that generates the following $1$D random walk $(100$ steps$)$: each time the position of the marker changes by $-1,0,$ or $1.$ The marker starts its walk at x $=15.$

Write a script to answer the following questions:

What is the final location of the marker $($assign the result to x$)?$

What is the total distance travelled by the marker $($assign the result to d$)?$

Hint: consider using a built$-$in function called abs for finding the absolute value and thus the travelled distance.