Let x and y be integers containing exactly five digits such that their digits occur in reverse order.For example, one possible pair is x = 12345, and y = 54321.Prove that x = y(mod9)

Problem 12 Let x and y be integers containing exactly five digits such that their digits occur in reverse order. For example, one possible pair is x = 12345, and y = 54321. Prove that x = y(mod9