Write program in python 3 (IDLE)

(Co 4 and 8) Create a program to allow the user to enter a sequence of nonnegative numbers. The user ends the list with a negative number. At the end the sum of the nonnegative numbers entered is displayed. The program prints zero if the user provides non-nonnegative numbers. Sample output: Enter numbers to sum, negative number ends list Enter: 2 Enter: 5 Enter: 9 Enter. -1 Sum 16