struct Person {
    var firstName: String
    var lastName: String
    var fullName: String {
        return firstName + " " + lastName
    }
    var age: String {
        didSet {
            let numAge = Int(age)
            var ageScalars = age.unicodeScalars
            if numAge == nil {
                print("vnimane vozrast vveden neverno")
                ageScalars.removeAll{!charSet.contains($0)}
                age.unicodeScalars = ageScalar
            }
        }
    }
    let charSet = CharacterSet.decimalDigits
}
var person = Person(firstName: "Aziz", lastName: "Xuesos", age: "89h")
print(person.age)