Given a number and either "+" or "\*", return an addition or multiplication table with the dimensions of that number.

Specifications
--------------

* The input will be formatted as `dimension, operation`.
* The program should not return anything if the operation input is not + or \*.
* The program should not return anything if the dimension input is less than 1.

```
(4,*):
1 2 3 4
2 4 6 8
3 6 9 12
4 8 1216

(4,+):
1234
2456
3567
4678

```

The spaces between the numbers in the table should be equal to one less than the number of digits in `dimension^2` for multiplication, and for addition one less than the number of digits in `dimension * 2`.