Write a C program get$\_$letter.c that prints a letter from the alphabet in either uppercase or lowercase, given its position.

First, scan in a character.

This character will determine whether the letter should be printed in uppercase or lowercase.

The character entered will be either $\text{'}$y$\text{'}$ or $\text{'}$n$\text{'},$ i$.$e$.$ 'yes' or $\text{'}$no$\text{'}.$

If the character entered is $\text{'}$y$\text{'},$ then the letter should be printed in uppercase.

If the character entered is $\text{'}$n$\text{'},$ then the letter should be printed in lowercase.

Second, scan in an integer.

This integer is the 'index' that we will use to determine which letter of the alphabet to print.

The integer entered will be a number between $0$ and $25($inclusive$).$

This means that

index $0$ corresponds to $\text{'}$A$\text{'},$

index $1$ corresponds to $\text{'}$B$\text{'}$ and

so on till we reach index $25$ which corresponds to $\text{'}$Z$\text{'}.$