def checkLetter(kataPertama:str, kataKedua:str)-> bool:
kataPertamaLower = kataPertama.lower()
kataKeduaLower = kataKedua.lower()
for i in kataPertamaLower:
if i not in kataKeduaLower:
return False
return True
print(checkLetter('cat','antarctica'))
print(checkLetter('cat','australia'))
print(checkLetter('cat','ANTARCTICA'))
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