import json
# with open("tcapTracking.json",) as trackfile:
    
#     filedata=json.load(trackfile)
#     print("--------------------")
#     for keys in filedata:
#         print(keys)


items= set()
items.add(2)
items.add(6)
items.add(2)
items.add(4)
items.add(9)
items.add(21)
items.add(22)

print(items[3])