import itertools, copy
c = "ABCD"
cyc = itertools.cycle(c)
cyc_copy = copy.copy(cyc)
print(next(cyc_copy))
print(next(cyc_copy))
cyc_copy = copy.copy(cyc)
print(next(cyc_copy))
print(next(cyc_copy))
aW1wb3J0IGl0ZXJ0b29scywgY29weQoKYyA9ICJBQkNEIgpjeWMgPSBpdGVydG9vbHMuY3ljbGUoYykKCmN5Y19jb3B5ID0gY29weS5jb3B5KGN5YykKcHJpbnQobmV4dChjeWNfY29weSkpCnByaW50KG5leHQoY3ljX2NvcHkpKQoKY3ljX2NvcHkgPSBjb3B5LmNvcHkoY3ljKQpwcmludChuZXh0KGN5Y19jb3B5KSkKcHJpbnQobmV4dChjeWNfY29weSkp