Problem:
Score : 100 points

Problem Statement

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.

Sample Input 1

4 11

Sample Output 1

+

4+11=15.

Sample Input 2

3 5

Sample Output 2

*

3\times 5=15.

Sample Input 3

1 1

Sample Output 3

x

1+1=2 and 1\times 1=1, neither of which is 15.

Solution in JavaScript (node.js v5.12) (judge verdict: Accepted)

function Main(s){
  s = s.split(" ").map(a=>+a);
  var ans = "x";
  if(s[0] + s[1] === 15)ans = "+";
  if(s[0] * s[1] === 15)ans = "*";
  console.log(ans);
}
Main(require("fs").readFileSync("/dev/stdin","utf8"));