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#APL+WIN, 58 bytes
m←2 2⊤'_/~'⍳s←,⎕⋄(1+⍴s)=+/((↑m[0;]),m[1;])=m[0;],¯1↑m[1;]
Prompts for input of string, index origin 0 and uses ~ for upper character
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Prompts for input of string
