# Write a Python program to Count the Number of matching characters in a pair of string # Python code to count number of matching# characters in a pair of strings  # count functiondef count(str1, str2):     c, j = 0, 0          # loop executes till length of str1 and     # stores value of str1 character by character     # and stores in i at each iteration.    for i in str1:                      # this will check if character extracted from        # str1 is present in str2 or not(str2.find(i)        # return -1 if not found otherwise return the         # starting occurrence index of that character        # in str2) and j == str1.find(i) is used to         # avoid the counting of the duplicate characters        # present in str1 found in str2        if str2.find(i)>= 0 and j == str1.find(i):             c += 1        j += 1    print ('No. of matching characters are : ', c)  # Main functiondef main():     str1 ='aabcddekll12@' # first string    str2 ='bb2211@55k' # second string    count(str1, str2) # calling count function   # Driver Codeif __name__=="__main__":    main()