let splitInput = readLine()!.split(separator: " ")

// leastSignificantDigit
let lsdForH = Int(String(splitInput[0].last!))!
let lsdForS = Int(String(splitInput[1].last!))!

if (lsdForH - lsdForS) % 2 == 0 {
	print("Possible")
} else {
	print("Impossible")
}