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

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