using System;
using System.Linq;

namespace FromLeftToTheRight
{
    class Program
    {
        static void Main(string[] args)
        {
            int countOfNumbers = int.Parse(Console.ReadLine());

            for (int i = 0; i < countOfNumbers; i++)
            {
                int leftSum = 0;
                int rigtSum = 0;

                long[] currentNumbers = Console.ReadLine().Split(" ").Select(long.Parse).ToArray();

                long currentNumber1 = currentNumbers[0];
                long currentNumber2 = currentNumbers[1];

                while (currentNumbers[0] != 0)
                {
                    int currentDigit = (int)(currentNumbers[0] % 10);
                    leftSum += currentDigit;
                    currentNumbers[0] /= 10;
                }
                leftSum = Math.Abs(leftSum);

                while (currentNumbers[1] != 0)
                {
                    int currentDigit = (int)(currentNumbers[1] % 10);
                    rigtSum += currentDigit;
                    currentNumbers[1] /= 10;
                }
                rigtSum = Math.Abs(rigtSum);

                if (currentNumber1 > currentNumber2)
                {
                    Console.WriteLine(leftSum);
                }
                else
                {
                    Console.WriteLine(rigtSum);
                }
            }
        }
    }
}