p03302 SoundHound Inc. Programming Contest 2018 -Masters Tournament- - F
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
```python
a,b = list(map(int,input().split()))
if a*b == 15:
    print("*")
elif a+b == 15:
    print("+")
else:
    print("x")

```