sum program.rb

sum = 0
puts "Please enter a number:"
input = gets.chomp
while input != "Stop"
  if input.to_i.class ==
  Integer
    sum += input.to_i
    puts "Please enter a number:"
    input = gets.chomp
   else
    puts "Please enter a number:"
    input = gets.chomp
   end 
end
puts sum