Picture Gets Deleted From Canon Powershot a75

Hello friends, My name is Miller. I have Canon Powershot a75 camera for my personal use. Last night I was in the party that is organized by my friend on the occasion of his marriage anniversary. A lots of pictures are captured through my camera and my friend is demanding all images, but the problem is that, all picture Gets deleted from Canon Powershot a75. I am not understanding, what should be done, so if anyone have any proper idea, then please help me as soon as possible.

Picture Gets deleted from Canon Powershot a75

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