input: def digitSum(s):
      """Purpose
      Write a function to compute the sum of the ASCII values of uppercase letters only from the provided string.
  
      Examples:
          digitSum("") => 0
          digitSum("abAB") => 131
          digitSum("abcCd") => 67
          digitSum("helloE") => 69
          digitSum("woArBld") => 131
          digitSum("aAaaaXa") => 153
      """
output:     return sum(ord(char) for char in s if char.isupper())