l =[1,4,7,9,1,3,5,10,11]
l.sort() # sort the array
s=[]
for i in range(len(l)//2):
s.append(l[i]) # append some small value
s.append(l[-i -1]) # append some large value
if len(l)%2:
s.append(l[len(l)//2]) # for array with odd length
print(s)
# your code goes here
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