Suppose we flip a coin repeatedly, and we want to count the number of flips that showed heads until the first tail was found. For example, suppose we flipped a coin 10 times, and we got H, H, H, T, H, H, T, T, T, H, where H means heads and T means tails. In this case, the number of heads before the first tail would be 3. Write a MATLAB function called heads with one input and one output, where the input is a string with 'H' for heads and 'T' for tails, and the output is the number of heads until the first tail is found. For convenience, you can assume that the input will have at least one 'T' in it, so that your program can loop through the input elements until a 'T' is found without worrying about going past the end of the input string. For example, if the input is 'HHHTHHTTTH', then the output should be 3. Although there are ways to write this function without a while loop, use a while loop in your function because the point of this problem is to practice using while loops.