"a". One growth step works like this: take the current string, make a copy in which every letter is replaced by the next one in the alphabet (z wraps around to a), and append that copy to the end.
For example, "c" becomes "cd", and "zb" becomes "zbac".
Steps repeat until the string is at least position characters long. Return the character at position position (counting from 1).position=6 → 'c'
The string grows like this: "a" → "ab" → "abbc" → "abbcbccd". The sixth character is "c".
position=1 → 'a'
The first character is the original "a"; nothing needs to happen.
position=16 → 'e'
position=6
'c'
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