using System;

namespace FromLeftToRight
{
    class Program
    {
        static void Main()
        {
            int N = int.Parse(Console.ReadLine());


            for (int i = 1; i <= N; i++)
            {
                string number1 = null;
                string reverseNumber2 = null;

                string firstNumber = Console.ReadLine();

                for (int j = 0; j < firstNumber.Length; j++)
                {
                    if (firstNumber[j] != ' ')
                    {
                        number1 += firstNumber[j];
                    }
                    else
                    {
                        break;
                    }
                }
                for (int k = firstNumber.Length - 1; k >= 0; k--)
                {
                    if (firstNumber[k] != ' ')
                    {
                        reverseNumber2 += firstNumber[k];
                    }
                    else
                    {
                        break;
                    }
                }

                string number2 = null;

                for (int r = reverseNumber2.Length - 1; r >= 0; r--)
                {
                    number2 += reverseNumber2[r];
                }

                long num1 = long.Parse(number1);
                long num2 = long.Parse(number2);

                long sumDigits = 0;

                if (num1 > num2)
                {
                    while (num1 != 0)
                    {
                        sumDigits += num1 % 10;
                        num1 /= 10;
                    }
                }
                else
                {
                    while (num2 != 0)
                    {
                        sumDigits += num2 % 10;
                        num2 /= 10;
                    }
                }
                Console.WriteLine(Math.Abs(sumDigits));
            }
        }
    }
}