PY
py
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i = int(input())
if i <= 0:
print("Z{-∞, 0}")
elif 0 < i and i < 5:
print("Z{1, 4}")
elif 5 <= i <= 10:
print("Z{5, 10}")
elif i in range(11, 21):
print("Z{11, 20}")
elif i > 20:
print("Z{21, ∞}")
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OUTPUT
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