C language please!

13.15 Loops - Ex3 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: BC DEF GHIJ KLMNO PORSTU Example 2: QR STU ZABCD EFGHIJ Example 3: gh ijk lmno pgrst uvwxyz