import java.util.Scanner;
class Main {
  public static void main(String[] args) {
  int a;
  int b;
  int c;
  int p;
  double S;
  Scanner sc = new Scanner(System.in);
   a = sc.nextInt();
   b= sc.nextInt();
   c = sc.nextInt();
   S=(a+b+c)/3;
    System.out.println('S');
  }
}