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:
[54, 27, 20, -9]

Ex Output:
[40.5, 23.5, 5.5]


Ex Input:
[10, 69, 6, -80, -39, 74]

Ex Output:
[39.5, 37.5, -37.0, -59.5, 17.5]


Ex Input:
[-98, 52, 20, 61, -66, -55, -71, 11, 58, -65, 51, 54]

Ex Output:

[-23.0, 36.0, 40.5, -2.5, -60.5, -63.0, -30.0, 34.5, -3.5, -7.0, 52.5]