PROGRAMMING:Matrix of T series

According to the n value read in, the character rectangle with @ as filling character, n width and N height is output.
###Input format:
The input data has only one positive integer n (0 ≤ n ≤ 39). When n = 0, it means the end of input.
###Output format:
Output a character rectangle with @ as filling character, n width and N height.
###Input example:
Here is a set of inputs. For example:
```in
one
```
###Output example:
The corresponding output is given here. For example:
```out
@
```







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