Write the function input_array which prompts the user for a list containing non-negative integers or 0. The user ends the list by entering a negative number or up to 10 integers\.\** Assume that the user will not enter more than 10 integers**. Store the list of integers into the array passed in as the first input parameter. Do NOT store the negative number to end user input (if that is how the user ends the list) into the array. The function returns the number of non-negative integers or 0 values entered by the user. Write the function count_keys which computes and returns the number of occurrences of a key value in a list.