In Tom's postal service, each PO box is labeled with a letter followed by an integer. Given integers numRows and numColumns, output the label for each PO box, followed by a space. End each row with a newline.

Click here for example

Ex: If the input is $34,$ then the output is:

A$1$ A$2$

B$1$

$Cl,C2,C3,C4$

Note:

Rows are in alphabetical order. PO boxes in the first row all start with the letter A$.$

Columns are in ascending order. PO boxes in the first column all end with the integer $1.$