count the vowels

A sentence lives in .data (a famous one: it uses every letter of the alphabet). Count its vowels.

Strings are just bytes ending in a zero. Load one byte at a time with ldrbLoad byte into Wt., stop at the terminator, and bump the count for every a, e, i, o, or u. Character literals like 'a' work directly in cmp`SUBS ZR, Rn, op2`. Sets NZCV, discards result., and the post-indexed form ldrb wX, [ptr], 1 loads and advances the pointer in one instruction.

what is checked

• the vowel count is printed on its own line
• the program exits cleanly
• the walk is byte by byte (ldrbLoad byte into Wt. present, count not written in)