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:
[-18, 63, 49, 17, 1]

Ex Output:
[22.5, 56.0, 33.0, 9.0]


Ex Input:
[-42, -76]

Ex Output:
[-59.0]


Ex Input:
[-10, -87, -71, -13, -19, 8, -46, 21, 41, 70, -20, -15, 49, 31, 11]

Ex Output:

[-48.5, -79.0, -42.0, -16.0, -5.5, -19.0, -12.5, 31.0, 55.5, 25.0, -17.5, 17.0, 40.0, 21.0]