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Boring solution in Clear category for Common Words by Vulwsztyn
def checkio(f, s):
o=[]
f=f.replace(',',' ')
s=s.replace(',',' ')
for i in f.split():
if i in s.split():
o.append(i)
o.sort()
o=','.join(o)
return o
Oct. 31, 2016
