$30\mathrm{.}11$ Clone or LAB: Is array sorted

Write a program that reads a list of integers from input into an array and outputs "yes' if the list is sorted in ascending order between two provided positions. Otherwise, output $\text{'}$no$\text{'}.$ The first input specifies the number of items in the list. The next set of inputs is the list. The last two inputs are the start and end positions $($inclusive$)$ Assume the list contains less than $20$ integers and position $1$ is the first element.

Ex If the input is:

$8.$

$5,6,7,4,3,2,1,0$

$13$

the output is:

yes

Ex$.$ If the input is:

$6$

$1,2,3,4,5,2$

$4\mathrm{.}5$

the output is

no