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def shellSort(arr): 

    n = len(arr)
    gap = int(n/2)

    while gap > 0: 

        for i in range(gap,n): 

            temp = arr[i] 
            j = i 
            while  j >= gap and arr[j-gap] > temp: 
                arr[j] = arr[j-gap] 
                j -= gap 
            arr[j] = temp 
        gap = int(gap/2)

arr = [ 12, 34, 54, 2, 3] 

n = len(arr) 
print ("Before sorting:") 
for i in range(n): 
    print(arr[i]), 

shellSort(arr) 

print ("\nAfter sorting:") 
for i in range(n): 
    print(arr[i]),

Before sorting:
12
34
54
2
3

After sorting:
2
3
12
34
54