How to add individual digits

Hello I want to get a 9 digit number from the user and add them all up together; for example, user encodes "222222222" then this should add up to 18 but my code doesnt show that. Here is what I have done:

Userinput = input('Please enter a code to break:','s');

if strlength(Userinput) ~= 9

disp ('Decoy Message: Not a nine-digit number.');

end

v = Userinput(1)+Userinput(2)+Userinput(3)+Userinput(4)...

+Userinput(5)+Userinput(6)+Userinput(7)+Userinput(8)+Userinput(9);

disp(v);

Answer 1

[David Hill]

U = sum(input('Please enter a code to break:','s')-'0');