import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String args[]) throws IOException {

		BufferedReader inReader = new BufferedReader(new InputStreamReader(System.in));

		String input = inReader.readLine();
		Integer length = Integer.valueOf(input);

		int[] checkValue = new int[length + 1];
		checkValue[0] = 0;
		for (int i = 0; i < length; i++)
			checkValue[i + 1] = Integer.valueOf(inReader.readLine());

		for (int i = 0; i < checkValue.length - 1; i++)
		{

			if (Math.abs(checkValue[i] - checkValue[i + 1]) != 1)
			{
				System.out.println("F");
				return;
			}
		}

		System.out.println("T");
		return;
	}
}