a=eval(input("Enter double"))
a=int(a)
if a<0:
print("done")
else:
while True:
print(a)
a=a-2
if a<0:
break
solo
a=eval(input("Enter double"))
a=int(a)
if a<0:
print("done")
else:
while True:
print(a)
a=a-2
if a<0:
break
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