using System;
using System.Linq;
using System.Collections.Generic;

class No432
{
    static void Main()
    {
        var length = Int32.Parse(Console.ReadLine());
        var ansList = new List<int>();
        for (int i = 0; i < length; ++i)
        {
            var list = Console.ReadLine().ToCharArray().Select(x => x-'0').ToList();
            var l = list.Count();
            for (int j = l - 1; j > 0; --j)
            {
                for (int k = 0; k < j; ++k)
                {
                    var num = list[k] + list[k + 1];
                    list[k] = num < 10 ? num : num/10 + num%10;
                }
            }
            ansList.Add(list[0]);
        }
        foreach(var an in ansList){
            Console.WriteLine(an);
        }
    }
}