import java.util.*;

class Ximo {
  public static void main(String[] args) {
    Scanner a = new Scanner(System.in); 
    String b = a.next(); 
    if (b.equals("A+")) {
      System.out.println(4.3); 
    } else if (b.equals("A")) {
      System.out.println(4.0); 
    } else if (b.equals("A-")) {
      System.out.println(3.7); 
    } else {
      System.out.println(-3.0); 
    }
  }
}