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

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int na = int.Parse(Console.ReadLine());
            int[] pa = new int[na + 1];
            for (int i = 1; i < na + 1; i++)
            {
                pa[i] = int.Parse(Console.ReadLine());
            }
            var pb = pa.Skip(1).Select((n, i) => Math.Abs(n - pa[i]));
            Console.WriteLine(pb.All(n => n == 1) ? "T" : "F");
            Console.ReadLine();
        }
    }
}