C Language Program: "Write a program that reads input as a stream of characters until encountering EOF. Have it report the number of uppercase letters, the number of lowercase letters, and the number of other characters in the input. You may assume that the numeric values for the lowercase letters are sequential and assume the same for uppercase. Or, more portably, you can use appropriate classification functions from teh ctype.h library."

I found so many answers in the chegg, but none of them working properly. So, please help me with the correct answer. Please do not just copy and paste from chegg. I need your thorough explanation and correct answers. Thanks for your help!