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.