Position

Write a function @pos_a(s, k)@ that takes a string $s$ and a non-negative integer $k$ and returns the position where the $k$-th letter a occurs within $s$, or -1 if the string $s$ contains fewer than $k$ letters a.

Sample session

Problem information

Author: InfBesos

Generation: 2026-05-21T12:05:48.716Z

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