Replying...
Intro. You met two girls Lisa and Alla. Lisa is 11 years old, and Alla is only 9 years old. There is an accident here. For example, I chose Alla since she is younger, but she is a child, Capricious, wants to play. But if I chose Lisa, then she is older, you are like a brother (Lisa's sister) and she helps. That is, Alla was not lucky with her, and Lisa was lucky with her.

Lucky or unlucky.

@Антон Селезнев