A JS one-liner
alphaPosition = s => [...s.toLowerCase().replace(/[^a-z]/g, '')].map(c => c.charCodeAt(0) + 1 - 'a'.charCodeAt(0)).join(' ');
Output:
> alphaPosition("The sunset sets at twelve o' clock.") < "20 8 5 19 21 14 19 5 20 19 5 20 19 1 20 20 23 5 12 22 5 15 3 12 15 3 11"
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A JS one-liner
Output: