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

inputFormat

input are integers.

Input

Input is given from Standard Input in the following format:

a b

outputFormat

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

样例

4 11

+