Python :

a ) Write an efficient program to return the duplicate characters from given String, for example, if given String is "C++" then your program should print "+" Similarly, if the input is "Java and JavaScript" then your program should print "J", "a" and "v". User Input is not case sensitive z = Z.

b) Also print the count of occurrences next to the duplicate characters: Input -> Java and JavaScript Output -> j occurs 2 times, a occurs 5 times, v occurs 2 times