You are given two integers a and b. Determine if a+b=15 or a\times b=15 or neither holds.

Note that a+b=15 and a\times b=15 do not hold at the same time.

Constraints

* 1 \leq a,b \leq 15
* All values in input are integers.

Input

Input is given from Standard Input in the following format:


a b


Output

If a+b=15, print `+`; if a\times b=15, print `*`; if neither holds, print `x`.

Examples

Input

4 11


Output

+


Input

3 5


Output

*


Input

1 1


Output

x

import java.util.Arrays;
import java.util.Scanner;

public class Main {

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

	    int a=gi();
	    int b=gi();
	    //System.out.print();
	    if (a+b==15) {
	    	System.out.print("+");
	    }else if(a*b==15) {
	    	System.out.print("*");
	    } else {
	    	System.out.print("x");
	    }



	}

	public static long d(long n) {
		String a=String.valueOf(n);
		return (long)a.length();
	}

	// 文字列として入力を取得
	public static String gs() {
		return scanner.next();
	}

	// intとして入力を取得
	public static int gi() {
		return Integer.parseInt(scanner.next());
	}

	// longとして入力を取得
	public static long gl() {
		return Long.parseLong(scanner.next());
	}

	// doubleとして入力を取得
	public static double gd() {
		return Double.parseDouble(scanner.next());
	}
}