package FirstTelerikPractice;

import java.util.Scanner;

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

        int num1 = Integer.parseInt(scanner.nextLine());
        int num2 = Integer.parseInt(scanner.nextLine());
        int num3 = Integer.parseInt(scanner.nextLine());

        int sum = num1 + num2 + num3;

        if (sum > 0)
            if (num1 > 0 || num2 > 0 || num3 > 0){
            System.out.println("+");
        } else if (num1 < 0 || num2 < 0 || num3 < 0) {
            System.out.println("-");
        } else if (sum == '0') {
            System.out.println("0");
        }
    }
}