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First solution in Clear category for Common Words by DominikKossinski
def checkio(first, second):
first=first.split(',')
second=second.split(',')
odp=[]
for i in first:
for j in second:
if(i==j):
odp.append(i)
odp.sort()
o=""
n=len(odp)
z=0
for i in odp:
o=o+i
if(n>1):
if(z
Oct. 21, 2016
