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##CJam, 13 bytes

Fixed to work with input without numbers thanks to Dennis! Also saved a byte by replacing the letters array with an array of ASCII above code point 64. And then another byte saved by Dennis!

q_A,s-Ser~]1b

Simple transliteration from letters to spaces, then eval and sum. Try it online.

CJam, 13 bytes

Fixed to work with input without numbers thanks to Dennis! Also saved a byte by replacing the letters array with an array of ASCII above code point 64. And then another byte saved by Dennis!

q_A,s-Ser~]1b

Simple transliteration from letters to spaces, then eval and sum. Try it online.

##CJam, 14 bytes

Fixed to work with input without numbers thanks to Dennis! Also saved a byte by replacing the letters array with an array of ASCII above code point 64.

q'{,64>Ser~]1b

Simple transliteration from letters to spaces, then eval and sum. Try it online.

##CJam, 13 bytes

Fixed to work with input without numbers thanks to Dennis! Also saved a byte by replacing the letters array with an array of ASCII above code point 64. And then another byte saved by Dennis!

q_A,s-Ser~]1b

Simple transliteration from letters to spaces, then eval and sum. Try it online.

##CJam, 15 bytes

Fixed to work with input without numbers thanks to Dennis!

q'[,_el^Ser~]1b

Simple transliteration from letters to spaces, then eval and sum. Try it online.

##CJam, 14 bytes

Fixed to work with input without numbers thanks to Dennis! Also saved a byte by replacing the letters array with an array of ASCII above code point 64.

q'{,64>Ser~]1b

Simple transliteration from letters to spaces, then eval and sum. Try it online.