From Left To The Right

using System;
using System.Numerics;
using System.Linq;

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

        for (int i = 1; i <= n; i++)
        {
            BigInteger leftSum = 0;
            BigInteger rightSum = 0;
            string number = Console.ReadLine();

            // Split the input string into two parts
            string[] sides = number.Split();
            BigInteger leftSide = BigInteger.Parse(sides[0]);
            BigInteger rightSide = BigInteger.Parse(sides[1]);

            if (leftSide > rightSide)
            {
                while (leftSide > 0)
                {
                    leftSum += leftSide % 10;
                    leftSide /= 10;
                }

                Console.WriteLine(leftSum);
            }
            else
            {
                while (rightSide > 0)
                {
                    rightSum += rightSide % 10;
                    rightSide /= 10;
                }

                Console.WriteLine(rightSum);
            }
        }
    }
}