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:
[12, -25, -52]

Ex Output:
[-6.5, -38.5]


Ex Input:
[25, -98, 18, -50, -94, 47, 36, -77, -89, 56, -98, -81]

Ex Output:

[-36.5, -40.0, -16.0, -72.0, -23.5, 41.5, -20.5, -83.0, -16.5, -21.0, -89.5]