import java.util.*;

public class Main{
  public static void main(String[] args) {
   Scanner sc = new Scanner(System.in);
   String  s = sc.next();
   char[] leader = s.toCharArray();
   int count1 = 0;
   int count2 = 0;
   for(int i = 0; i < 4; i++){
     if(leader[i] == '+'){
       count1++;
     }else{
       count2++;
     }
   }
   System.out.println(count1 - count2);
 }

}
