using System;

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

        for (int i = 0; i < n; i++)
        {
            string numbers = Console.ReadLine();
            int index = numbers.IndexOf(' ');
            long leftNumber = long.Parse(numbers.Substring(0, index));
            long rightNumber = long.Parse(numbers.Substring(index));

            long sum = (leftNumber > rightNumber) ?
                CalculateDigitSum(leftNumber) :
                CalculateDigitSum(rightNumber);

            Console.WriteLine(sum);
        }
    }
    static long CalculateDigitSum(long number)
    {
        long sum = 0;
        while (number != 0)
        {
            sum += number % 10;
            number /= 10;
        }
        return Math.Abs(sum);
    }
}