Background

Description

只形成外围为+内围为-（如输入5）：

Format

Input

Output

Samples

5

+++++
+---+
+---+
+---+
+++++

7

+++++++
+-----+
+-----+
+-----+
+-----+
+-----+
+++++++

Limitation

1s, 1024KiB for each test case.