Remove vowels from text for linguistic analysis, puzzles, or creative writing
Input: "The quick brown fox jumps over the lazy dog."
Output (vowels removed): "Th qck brwn fx jmps vr th lzy dg."
Input: "Cryptography and system analysis require years of study."
Output (preserving Y): "Cryptgrphy nd systm nlyss rqyr yrs f stdy."
Input: "UPPERCASE vowels and lowercase vowels."
Output (only uppercase vowels removed): "PPRCS vowels and lowercase vowels."