"Custa" is a tricky word in terms of spelling. It is often misspelled as "kusta" or "kostya". However, the correct way to spell the word is "custa" which is pronounced as "kuh-stuh". The IPA phonetic transcription for "custa" is /ˈkʌstə/, where /ʌ/ is the symbol for the "uh" sound, and /ə/ represents the "uh" sound in the unstressed syllable. So, the next time you encounter the word "custa", remember to spell it with a "c" and not a "k".