using System;

namespace From_Left_to_the_Right
{
    class Program
    {
        static void Main(string[] args)
        {
            int input = int.Parse(Console.ReadLine());
            int sumOfLeftNumber = 0;
            int sumOfRightNumber = 0;
            int sum = 0;


            for (int i = 0; i <= input; i++)
            {
                int leftNumber = Convert.ToInt32(Console.ReadLine());
                int rightNumber = Convert.ToInt32(Console.ReadLine());

                if (leftNumber > rightNumber)
                {
                while (leftNumber > 0)
                    {
                        int lastNum = leftNumber % 10;
                        sum = sum + lastNum;
                        leftNumber = leftNumber / 10;

                    }


                }
            }




        }
    }
}