char data [ ] = { 'a', 'b', 'c', 'D', 'E', 'f', 'g', 'h', 'I', 'J', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'w', 'x', 'y', 'z' } ;

5. write a simple c program to check if the array contains all the letters of the alphabet exactly once. It is called perfect pangram. But If any letter is missing, it is not a pangram.