Is Gina's chest an A?

Gina has a breast. The bust under a cup is 56cm, and the bust difference is about 10cm. A cup is divided into a type and AA type. If the figure obtained by subtracting the bust from the lower bust is about 7.5cm, then the bust of this girl is AA cup. If the number obtained by subtracting the two is about 10cm, then the girl's bust is a cup.