In this task you are given a list of numbers and you need to find the average of each two consecutive values. The average of two numbers a and b is calculated as: (a + b) /2. The output should be a list of the averages of each two consecutive values. A list is presented with two brackets and comma-separated values, like: [1,2,3].

Ex Input:
[40, 34, -39]

Ex Output:
[37.0, -2.5]


Ex Input:
[43, -57]

Ex Output:
[-7.0]


Ex Input:
[18, -40, -15, 32, 90, -10]

Ex Output:

[-11.0, -27.5, 8.5, 61.0, 40.0]