'how to make repetitive request of the input?

I write this code to get the of digit of the number inputted by the user

the problem I don't know how to make it repetitive to user to get the request of entering the input again and again

x=input("enter the number you want to get the sum of its' sum: ")
z=0
for a in x:
    z=z+int(a)
print(z)

python for-loop

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Solution	Source