import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main {

  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String s = br.readLine();
    br.close();
    int p = s.length() - s.replaceAll("\\+","").length();
    int m = s.length() - 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