Bulk rename in bash

here i found a very simple command flow to rename
the files in a folder by sequence order

i have list of *.png file with different names for example

Monsters-University-Icon-5.png
Monsters-University-James-P-Sullivan-Icon-2.png
.
.

i need to rename in to

Mon01.png
Mon02.png
.
.

here is a solutions

#!/bin/bash
a=1
for  i in *.png; do
new=$(printf "Mon%02d" ${a})
mv ${i} ${new}
let a=a+1
done

it will do the magic..