import java.util.*;

public class Main{
  static StringBuilder sb = new StringBuilder("");
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int T = sc.nextInt();
    int[] x = new int[T];
    for (int i=0;i<T ;i++ ) {
      x[i]=sc.nextInt();
    }
    sc.close();
    if (x[0]==0) {
      System.out.println("F");
      System.exit(0);
    }
    if (T==1) {
      if (!(x[0]==1||x[0]==-1)) {
        System.out.println("F");
        System.exit(0);
      }
    }
    for (int i=0;i<T-1 ;i++ ) {
      int k =x[i+1]-x[i];
      if (k*k!=1) {
        System.out.println("F");
        System.exit(0);
      }
    }
    System.out.println("T");
  }
}