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| tmp=input('Enter the year:')
while not tmp.isdigit() :
tmp=input('Enter a \'number\' again:')
year=int(tmp)
a=year/4
b=year/100
c=year/400
d=int(c)
e=int(a)
f=int(b)
if d==c:
print(year,'YES')
else:
if a==e and f!=b:
print(year,'YES')
else:
print(year,'NO')
|