A list is given. Return a new list having the sum of all its elements except itself. For more clarity, check the examples below.
Clarification
[1, 2, 3, 4] = for first element => sum will be 2+3+4 = [9]
[1, 2, 3, 4] = for second element => sum will be 1+3+4 = [9, 8]
[1, 2, 3, 4] = for third element => sum will be 1+2+4 = [9, 8, 7]
[1, 2, 3, 4] = for fourth element => sum will be 1+2+3 = [9, 8, 7, 6]