Problem Statement
Write a C program that reads an integer and calculates the sum of all its digits that are greater than 5.
For example, if the input is 123456789, the digits greater than 5 are 6, 7, 8, and 9. Their sum is 6 + 7 + 8 + 9 = 30.
If there are no digits greater than 5 in the number, output 0.
Note: Handle negative numbers by ignoring the negative sign and working with the absolute value.