QualificationRound No.1 Beautiful strings

1_BeautifulStrings.py

import sys
from string import ascii_lowercase

def getCharFrequency(string):
    result = dict()
    for c in string:
        lowerC = c.lower()
        if lowerC in ascii_lowercase:
            if not result.has_key(lowerC):
                result[lowerC] = 1
            else:
                result[lowerC] += 1
    return result

def evaluate(string):
    Cdict = getCharFrequency(string)
    num = 26
    result = 0
    for c, count in sorted(Cdict.items(), key=lambda x:x[1],
            reverse=True):
        result += num * count
        num -= 1
    return result


m = int(sys.stdin.readline())
for i in xrange(m):
    string = sys.stdin.readline().rstrip()
    print("Case #{0:d}: {1:d}".format(i+1, evaluate(string)))