How do I total the random numbers generated in ruby

I have the code, that will generate random numbers, unless the generated random number is 0. When the result is 0, the loop breaks.

So when the loop breaks, I want a code, that keeps adding the random numbers that kept generated and display it at the last. Can I do that in ruby?

def batting
    loop do
    runs = [0,1,2,3,4,5,6]
    myruns = runs.shuffle.first
    Newscore = 
    puts "Press W to hit a shot"
    user_input = gets.chomp
    while user_input.include? "W"
        puts myruns
        until myruns == 0
            break
            Score = Score + myruns
            break

This is throwing Dynamic Constant assignment error at Score = Score + myruns which I basically thing, its wrong, since the myruns keep changing at every generated event?

So, I would want to create a new variable, that would store the total of all the random numbers generated until the generated random number is 0.

Could anyone help?