''' Counting occurrences of a character in a string means counting all substrings of a character from the input string. In this , I’ll walk you through how to count character occurrences using Python.

Two string values S1 and S2 are passed as input. The program must print the count of common characters in the strings S1 and S2. Assume the alphabets in S1 and S2 will be in lower case. Input Format: ...