Question : parsing a string using Shell script

How do I parse a string and retrieve the last 3 digits and add 4 to the start of the 3 digits

the string could be in following formats:

customer100
cust100

I need to retrieve the last 3 digits and add 4 to that. i.e 4100 in shell script. Please advise.

Answer : parsing a string using Shell script 

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#!/bin/ksh
string='customer100'
echo 4${string##[a-z]*[a-z]}
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