import sys
def main():
    if(len(sys.argv)<3):
        print "Please give three numbers to run this program"
        sys.exit(0)                # use this to quit the program
    num1 = float(sys.argv[1])
    num2 = float(sys.argv[2])
    num3 = float(sys.argv[3])

    #1. Implement a function myMax, and use that function to get the maximum number (Max123) between num1, num2, and num3.
    Max123 = myMax(num1,num2,num3)
    print Max123

    #2. Implement a function ProcessScore which takes the value of Max123 as input parameter, and return 'A' if the input is larger than 90, 'B' if the input is in [80,90), otherwise return 'C'
    Score = ProcessScore(Max123)
    print Score

    #3. Consider the following tuple, implement a function countScore which count how many times the score in the tuple
    myTuple = ("A","B","A","A","C","C","C","B","A","B","B","C","A","B","A","A","C","G","F","B","C")
    frequency = countScore(Score,myTuple)
    print frequency

    #4. Bonus: take myTuple as input parameter, return a dictionary, the key is the unique letter in myTuple, the value is the frequncy of that letter.
    #          in this case, you should get: "A":7, "B":6, "C":6, "G":1, "F":1
    myDict = StatisticAnalysis(myTuple)
    key = "A"
    if key in myDict:                     # this is check if the key is existed in the dictionary
        print key + ":" + str(myDict[key])
    key = "B"
    if key in myDict:
        print key + ":" + str(myDict[key])
    key = "C"
    if key in myDict:
        print key + ":" + str(myDict[key])
    key = "G"
    if key in myDict:
        print key + ":" + str(myDict[key])
    key = "F"
    if key in myDict:
        print key + ":" + str(myDict[key])

# implement all your function here ...



# This is the standard boilerplate that calls the main() function.
if __name__ == '__main__':
    main()