converting letters to numbers

[kjakupak]

I have to define a function add(c1, c2), where c1 and c2 are capital letters; 
the return value should be the sum (obtained by converting the letters to 
numbers, adding mod 26, then converting back to a capital letter). 

All I have so far is:

def add(c1, c2):
    ord(c1) - ord('a') + 1
    ord(c2) - ord('a') + 1

I know I need to use ord and chr, just not sure how.
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