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]

shellSort(arr)

print(arr)