how to fetch month format files in a file

UNIX for Beginners Q & A UNIX for Dummies Questions & Answers
1

I have files like
pra.01
sra.02
see.03
swc.03
sre.04
after dot it contain month format when ever user type "01" month i have to fetch what are 01 files to come

2 
 
read usrInput
ls -l *$usrInput
3

expecting this ???

$ cat filename
#!/bin/bash
printf "Enter the month input: "; read a
ls -ltr *.$a
$
$ sh filename
Enter the month input: 01
-rw-rw-rw-   1 userid   grpid         0 Aug 29 07:05 pra.01
$