Position of Difference

Design a function @pos_dif(r, s)@ that, given two strings $r$ and $s$, returns the first position at which $r$ and $s$ are different. If $r$ and $s$ are equal, the function must return $-1$.

Sample session

Problem information

Author: InfBesos

Generation: 2026-01-25T14:54:23.006Z

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