Problem from Lisic#11392

Problem from Lisic

1 Sekunde

128 Megabyte

Sehr leicht

Zakhar_lutii, said Lisic, can you write a program that will reproduce my masterpiece painting called "Snails after the rain"? Help Zakhar_lutii with this task. Given a positive integer $n$ , print a figure that has $n$ rows and $2 n - 1$ 2n-1 columns, composed of the snail character '@' and the character ':', as shown in the example below.

Eingabe

One positive integer $n$ ( $n > 1$ n > 1).

Ausgabe

Output a figure of size $n \times (2 n - 1)$ n \times (2n-1) following the described pattern.

Beispiele

Beispiel 1

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2 n - 1

n > 1

n \times (2 n - 1)