In the evening, as usual, you decided to go shopping for groceries. Having collected the groceries, you quickly went to the checkout, when the cashier scanned all the products, she asked about the payment method, you habitually held up your card, but the sign said "insufficient funds". You were very confused, when suddenly a man's hand with a card in his hand flashed past your head, and the characteristic sound of payment was heard

"I'll pay"

he said