import java.util.Scanner;
public class Test5{
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int a=sc.nextInt();
if(a>0&&a<=18){
System.out.println("少年");
}
else if(a>=19&&a<=28){
System.out.println("青年");
}
else if(a>=29&&a<=55){
System.out.println("中年");
}
else if(a>=56){
System.out.println("老年");
}else{
System.out.println("error!");
} sc.close();
}
}