using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;

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