import java.util.*;
class Main{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        char a=sc.next();
        if(Character.isLetter(a)){
            System.out.println("Letter");
        }
        else if(Character.isDigit(a)){
            System.out.println("Digits");
        }
        else{
            System.out.println("Special Character");
        }
    }
}