def numOperations(testStr):

     num = 0

     n = len(testStr)

     for i in range(n / 2):

         num += abs(ord(testStr[i]) - ord(testStr[n - i - 1]))

     return num

 def main():

     t = int(raw_input())

     for _ in range(t):

         testStr = raw_input().strip()

         print numOperations(testStr)

 main()