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:
[-39, -78, -10, -56, 67, 4, 97, 31]

Ex Output:
[-58.5, -44.0, -33.0, 5.5, 35.5, 50.5, 64.0]


Ex Input:
[29, -54, 81, -85, 51, -12, -11, -68, 38, 83, 46]

Ex Output:
[-12.5, 13.5, -2.0, -17.0, 19.5, -11.5, -39.5, -15.0, 60.5, 64.5]


Ex Input:
[-77, -60, -10, 0, 19, -98, -93, 54, 90, -34, 80]

Ex Output:

[-68.5, -35.0, -5.0, 9.5, -39.5, -95.5, -19.5, 72.0, 28.0, 23.0]