import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        int p = 0;
        int m = 0;
        String a = "+";

        for(int i=0; i<4; i++){
            if(s.charAt(i)==a.charAt(0)){
                p += 1;
            }
        }
        m = 4 - p;

        System.out.println(p - m);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz