As you see in Example test cases, the os running this service is ```posix```.
Return the output by executing the command given as the string on posix os.
See the example test cases for the expected data format.
from subprocess import check_output

def get_output(s):
    return check_output(s.split()).decode('utf-8') 
from subprocess import check_output

def get_output(s):
    return check_output(s.split()).decode('utf-8') 