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:
[-36, 17, -25, -21, 45, 34, -39, 21, 71]

Ex Output:
[-9.5, -4.0, -23.0, 12.0, 39.5, -2.5, -9.0, 46.0]


Ex Input:
[77, 66, 11]

Ex Output:
[71.5, 38.5]


Ex Input:
[-60, -49, -52, 6, 49, 22, 87, 81, -19, -69, 23, 40]

Ex Output:

[-54.5, -50.5, -23.0, 27.5, 35.5, 54.5, 84.0, 31.0, -44.0, -23.0, 31.5]