ok a question for all you smart programmers.

I want to write a program where I input something like cdabe

and assuming
a=1
b=2
c=3
d=4
e=5

it gives me an answer/output of 34125

whats the best way to do this? I want it to be a windows app. Can I get some recommendations on whats the best way to do it, and the easiest language. I only know some c/c++. But I also want to learn others.

*note* sorry if I posted in the wrong section.