import java.util.*;

public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = 0;
    String s = sc.next();
    for (int i = 0;i<4;i++) {
      if ((s.charAt(i))=='+') a++;
      else a--;
    }
    System.out.println(a);
  }
}
