Getting substring with awk

Hi Team,
How to get the last 3 characters of a String irrespective of their length using awk?

Thanks
Kinny

An example for the first field:

awk '{print substr($1,length($1)-2)}'

$string="hello"
sed 's/.*\(.\{3\}\)$/\1/' <<< $string

You can use the above sed command also.
This will print "llo".

string="welcome"
echo ${string:(-3)}                        

The output is
ome

That worked like a charm. Thanks a Ton

awk -F "" '{print $(NF-2)$(NF-1)$NF}'