import java.io.*;
import java.util.*;
public class Tester {
public static void main(String args[]) {
Scanner kb = new Scanner(System.in);
System.out.print("Enter something like 8 + 33 + 1,345 -137 : ");
String s = kb.nextLine(); //Best to store in a String and then create a new Scanner
//object; otherwise, it can get stuck waiting for input.
Scanner sc = new Scanner(s);
sc.useDelimiter("");
s = "";
while (sc.hasNext()) {
while (sc.hasNext("\\s")) {
sc.skip("\\s*");
}
if (sc.hasNext()) {
s = s+sc.next();
}
}
System.out.println(s);
sc = new Scanner(s);
//Set delimiters to a plus sign surrounded by any amount of white space...or...
// a minus sign surrounded by any amount of white space.
sc.useDelimiter("\\+|\\-");
int sum = 0;
if (s.startsWith("-")) {
sum = sum-sc.nextInt();
} else {
sum = sum+sc.nextInt();
}
while (sc.hasNextInt()) {
String operation = sc.findInLine("\\+|\\-");
if (operation.equals("+")) {
sum = sum+sc.nextInt();
}
if (operation.equals("-")) {
sum = sum-sc.nextInt();
}
}
System.out.println(sum);
}
}