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