a啊

ah, oh, ha

ah, oh, ha; ah, oh, huh; what?, huh?, eh; what? oh? huh?

particle

English Wiktionary, “啊” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E5%95%8A · confidence: High (Wiktionary, PH/Quanzhou/Jinjiang)