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First solution in Clear category for Common Words by Wojtas1411
def checkio(first, second):
first=first.split(',')
second=second.split(',')
com=[]
for i in range(len(first)):
for j in range(len(second)):
if first[i]==second[j]:
com.append(first[i])
#print(first[i])
com.sort()
x=""
for i in range(len(com)):
x+=com[i]
if i!=len(com)-1:
x+=","
#print(x)
return x
#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
assert checkio("hello,world", "hello,earth") == "hello", "Hello"
assert checkio("one,two,three", "four,five,six") == "", "Too different"
assert checkio("one,two,three", "four,five,one,two,six,three") == "one,three,two", "1 2 3"
Nov. 2, 2016