// #region
enum Input {
  static func int() -> Int {
    return Int(readLine()!)!
  }

  static func ints() -> (Int, Int) {
    readLine()!.split(separator: " ").map { Int($0)! }[0, 1]
  }

  static func ints() -> (Int, Int, Int) {
    readLine()!.split(separator: " ").map { Int($0)! }[0, 1, 2]
  }

  static func string() -> String {
    readLine()!
  }
}

extension Bool {
  func print<T>(yes: T, no: T) {
    Swift.print(self ? yes : no)
  }
  func print() { self.print(yes: "Yes", no: "No") }
}

extension Int {
  func print() {
    Swift.print(self)
  }
}

extension String {
  func print() {
    Swift.print(self)
  }
}

extension Array {
  subscript(a: Int, b: Int) -> (Element, Element) {
    (self[a], self[b])
  }

  subscript(a: Int, b: Int, c: Int) -> (Element, Element, Element) {
    (self[a], self[b], self[c])
  }
}
// #endregion

let n = Input.string()
let n_p = Set(n)
(n_p.count == 1 && n_p.contains("9")).print()