Print a spiral matrix of size n rows and m columns.
For example, with a matrix of 5 rows and 6 columns:
123456181920212271728293023816272625249151413121110
### Input
- A single line containing two integers n and m.
### Output
- Print the spiral matrix.
### Constraints
- 1≤n,m≤100.
### Sample test
33
Output:
123894765