Help me with the following Matlab problem:

1. str = A quiet frog jumps when vexed by lazy ducks. "

Put the letters in the string in alphabetical order. (it is the letters in alphabetical order, not the words)

2.

.

Sort each row of A (shown above) and store the result in an array C. Also sort the rows of A so that the third column is in descending order and store in array D.

3 7 -4 12 5 9 10 2 A= |613811 15 5 4 1