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:
[81, 73]

Ex Output:
[77.0]


Ex Input:
[70, 22, 42, -61, -38, 33, -70]

Ex Output:
[46.0, 32.0, -9.5, -49.5, -2.5, -18.5]


Ex Input:
[-58, 19]

Ex Output:

[-19.5]