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


namespace tes
{
	class contest
	{
				
		
		static void Main(string[] args)
		{

			var n = int.Parse(Console.ReadLine());
            var arr = new string[n];
            for(int i =0; i< n; i++)
            {
                arr[i] = Console.ReadLine();
            }

            var ans = new int[n];
            for(int i =0; i< n; i++)
            {
                if (arr[i].Length > 1) ans[i] = ret(arr[i]);
                else ans[i] = int.Parse(arr[i]);
            }

            foreach(int item in ans)
            {
                Console.WriteLine(item);
                    
            }



			
		}	
		static int ret(string n)
        {
            string tmp = "";
            while(true)
            {
                tmp = "";
                for(int i=0; i<n.Length-1; i++)
                {
                    int t = n[i] - '0' + n[i + 1] - '0';
                    
                    if(t>=10)
                    {
                        string memo = t.ToString();
                        t = (memo[0]-'0') + (memo[1]-'0');
                    }
                    tmp += t.ToString();
                }

                n = tmp;

                if (n.Length == 1) break;
            }

            return int.Parse(n);

        }
			
	}
}