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-p
-1 due to @NahuelFouilleul
$_=lc;y/aeiou/AEIOU/$_=lc;y;aeiou;AEIOU
Try it online!Try it online!
Convert everything to lower case, then change vowels to upper case.
$_=lc;y/aeiou/AEIOU/
Try it online!
$_=lc;y;aeiou;AEIOU
