import java.io.*;
import java.util.*;

/*
 * To execute Java, please define "static void main" on a class
 * named Solution.
 *
 * If you need more classes, simply define them inline.
 */

class Main {
  
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
    char input = sc.nextLine().charAt(0);
    
    if(input >= 'A' && input <= 'Z'){
      System.out.println('A');
    } else {
      System.out.println('a');
    }
  }
} import java.io.*; io.* java import java.util.*; util.* java class Main {
  
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
    char input = sc.nextLine().charAt(0);
    
    if(input >= 'A' && input <= 'Z'){
      System.out.println('A');
    } else {
      System.out.println('a');
    }
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
    char input = sc.nextLine().charAt(0);
    
    if(input >= 'A' && input <= 'Z'){
      System.out.println('A');
    } else {
      System.out.println('a');
    }
  } main {
    Scanner sc = new Scanner(System.in);
    
    char input = sc.nextLine().charAt(0);
    
    if(input >= 'A' && input <= 'Z'){
      System.out.println('A');
    } else {
      System.out.println('a');
    }
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char input = sc.nextLine().charAt(0); input sc.nextLine().charAt(0) sc.nextLine().charAt sc.nextLine() sc.nextLine sc 0 if(input >= 'A' && input <= 'Z'){
      System.out.println('A');
    } else {
      System.out.println('a');
    } input >= 'A' && input <= 'Z' input >= 'A' input 'A' input <= 'Z' input 'Z' {
      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
import java.io.*;
import java.util.*;

/*
 * To execute Java, please define "static void main" on a class
 * named Solution.
 *
 * If you need more classes, simply define them inline.
 */

class Main {
  
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
    char input = sc.nextLine().charAt(0);
    
    if(input >= 'A' && input <= 'Z'){
      System.out.println('A');
    } else {
      System.out.println('a');
    }
  }
}
