fn main() {
    println!("What is your age?");

    let mut age = String::new();
        
    std::io::stdin()
        .read_line(&mut age)
        .expect("Error");

    let age: u32 = match age.trim().parse() {
        Ok(n) => n,
        Err(_) => {
            println!("Invalid age");
            return;
        }
    };
    
    println!("Your age is {}", age);
}