scores = {'Naveen' : 5,
          'Arthi' : 2,
          'Subash' : 4}
for key in sorted(scores):
    print("%s: %s" % (key, scores[key]))

dict = {2: 3, 1: 89, 4: 5, 3: 0}
od = sorted(dict.items())
print(od)