Write a Python program that will take a string consisting of only A, B and C's uppercase and lowercase mixed sequence from the user. Your progra should generate a dictionary having "A", "B", "C" as the keys and the frequency of "uppercase of key" in the string as the first indexed value, the frequency of "lowercase of key" in the string as the second indexed value and the summation of both the frequency as the third indexed value a list as the values. Last of all, your program should check if there are any pairs that are the best match, by comparing the total frequency. Sample Input 1 AaBbbbCcCc Sample Output 1 { "A": [1, 1, 2] "B": [1, 3, 4] "C": [2, 2, 4] } B and C are the best match.