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

class Program
{
    static void Main(string[] args)
    {
        int T = int.Parse(Console.ReadLine());
        int p = 0;
        for (int i = 0; i < T; i++)
        {
            int X = int.Parse(Console.ReadLine());
            if (Math.Abs(X - p) != 1)
            {
                Console.WriteLine("F");
                return;
            }
        }
        Console.WriteLine("T");
    }
}