C language and use nested loops please.

13.14 Loops - Ex2 Write a program that prints a pattern like the ones shown below. Ask the user to input the initial letter of the pattern (uppercase or lowercase). Consider the alphabet as a continuous list such that before the A comes Z (See example 2) Hint: Use nested loops Example 1: FE FED FEDC FEDCB FEDCBA Example 2: AZ AZY AZYX AZYXW AZYXWV Example 3: az azy azyX azyxw azyxwv