import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner kb=new Scanner(System.in);
		boolean isP=true;
		int n=kb.nextInt();
		int a[]=new int[n];
		for(int i=0;i<n;i++){
			a[i]=kb.nextInt();
		}

		for(int i=0;i<n;i++){
			if(a[i]+1!=a[i+1]||a[i]-1!=a[i+1]){
				isP=false;
				break;
			}
		}
		if(isP){
			System.out.println("T");
		}else{
			System.out.println("F");
		}

	}
}