import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    char alpha = scan.next().charAt(0);
    int code = (int)(alpha);
    if (65<=code && code<=90){
      System.out.println("A");
    }else{
      System.out.println("a");
    }
  }
} import java.util.Scanner; Scanner java.util public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    char alpha = scan.next().charAt(0);
    int code = (int)(alpha);
    if (65<=code && code<=90){
      System.out.println("A");
    }else{
      System.out.println("a");
    }
  }
} Main public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    char alpha = scan.next().charAt(0);
    int code = (int)(alpha);
    if (65<=code && code<=90){
      System.out.println("A");
    }else{
      System.out.println("a");
    }
  } main {
    Scanner scan = new Scanner(System.in);
    char alpha = scan.next().charAt(0);
    int code = (int)(alpha);
    if (65<=code && code<=90){
      System.out.println("A");
    }else{
      System.out.println("a");
    }
  } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) char alpha = scan.next().charAt(0); alpha scan.next().charAt(0) scan.next().charAt scan.next() scan.next scan 0 int code = (int)(alpha); code (int)(alpha) if (65<=code && code<=90){
      System.out.println("A");
    }else{
      System.out.println("a");
    } 65<=code && code<=90 65<=code 65 code code<=90 code 90 {
      System.out.println("A");
    } System.out.println("A") System.out.println System.out System System.out "A" {
      System.out.println("a");
    } System.out.println("a") System.out.println System.out System System.out "a" String[] args args public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    char alpha = scan.next().charAt(0);
    int code = (int)(alpha);
    if (65<=code && code<=90){
      System.out.println("A");
    }else{
      System.out.println("a");
    }
  }
} public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    char alpha = scan.next().charAt(0);
    int code = (int)(alpha);
    if (65<=code && code<=90){
      System.out.println("A");
    }else{
      System.out.println("a");
    }
  }
} Main
import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    char alpha = scan.next().charAt(0);
    int code = (int)(alpha);
    if (65<=code && code<=90){
      System.out.println("A");
    }else{
      System.out.println("a");
    }
  }
}
