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

class P
{
    static void Main()
    {
        int a = int.Parse(Console.ReadLine());
        int last = 0; 
        for (int i = 0; i < a; i++)
        {
            if(Math.Abs(int.Parse(Console.ReadLine()) - last) != 1) goto end;
        }
        Console.WriteLine("T");
        return;
        end:;
        Console.WriteLine("F");
    }
}