import java.io.BufferedReader;
import java.io.InputStreamReader;
 
public class Main {
 
	public static void main(String[] args) throws Throwable {
		BufferedReader vd = new BufferedReader(new InputStreamReader(System.in));
		String[] s = vd.readLine().split("");
    	int sum=0;
      for(int i=0;i<4;i++){
 	     if(s[i]=="+"){
           sum = sum+1;
         }
           if(s[i]=="="){
             sum=sum-1;
           }
  	  }
    System.out.println(sum);
 
  }
}