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++;
    else ans--;
  }
  System.out.println(ans);
}}