using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        var T = int.Parse(Console.ReadLine());
        var list = new List<int> { 0 };
        bool isRandomWalk = false;

        int x;
        for (int i=0; i<T; i++)
        {
            x = int.Parse(Console.ReadLine());
            if (x == list[0]) break;
            list.Add(x);
        }

        int pos;
        for (int j=0; j<list.Count -1; j++)
        {
            pos = Math.Abs(list[j + 1] - list[j]);
            isRandomWalk = (1 <= pos && pos < 2) ? true : false;
            if (!isRandomWalk) break;
        }

        Console.WriteLine((isRandomWalk == true) ? "T" : "F");
    }
}