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:
[30, -51, 47]

Ex Output:
[-10.5, -2.0]


Ex Input:
[33, 15, -60, -30, 13, 49]

Ex Output:
[24.0, -22.5, -45.0, -8.5, 31.0]


Ex Input:
[-71, 4, 91]

Ex Output:

[-33.5, 47.5]