1 students = {

     2     'Madhu': 12,

     3     'Shantanu':45,

     4     'Puneeth': 54,

     5     'Vattam': 35,

     6     'KD': 50,

     7     }

     8 

     9 all_marks = students.values()

    10 unique_marks = set(all_marks)

    11 

    12 print "Number of Duplicate marks: ", len(all_marks) - len(unique_marks)

    13 print "Duplicate marks: ", set(all_marks - list(unique_marks))