import java.util.*;

public class Main{
public static void main(String[] args){
  Scanner sc = new Scanner(System.in);
  char value = sc.nextLine().toCharArray()[0];
  if(Character.isUpperCase(value))
    System.out.println('A');
  else
    System.out.println('a');
}
} import java.util.*; util.* java public class Main{
public static void main(String[] args){
  Scanner sc = new Scanner(System.in);
  char value = sc.nextLine().toCharArray()[0];
  if(Character.isUpperCase(value))
    System.out.println('A');
  else
    System.out.println('a');
}
} Main public static void main(String[] args){
  Scanner sc = new Scanner(System.in);
  char value = sc.nextLine().toCharArray()[0];
  if(Character.isUpperCase(value))
    System.out.println('A');
  else
    System.out.println('a');
} main {
  Scanner sc = new Scanner(System.in);
  char value = sc.nextLine().toCharArray()[0];
  if(Character.isUpperCase(value))
    System.out.println('A');
  else
    System.out.println('a');
} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char value = sc.nextLine().toCharArray()[0]; value sc.nextLine().toCharArray()[0] sc.nextLine().toCharArray() sc.nextLine().toCharArray sc.nextLine() sc.nextLine sc 0 if(Character.isUpperCase(value))
    System.out.println('A');
  else
    System.out.println('a'); Character.isUpperCase(value) Character.isUpperCase Character value System.out.println('A') System.out.println System.out System System.out '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 sc = new Scanner(System.in);
  char value = sc.nextLine().toCharArray()[0];
  if(Character.isUpperCase(value))
    System.out.println('A');
  else
    System.out.println('a');
}
} public class Main{
public static void main(String[] args){
  Scanner sc = new Scanner(System.in);
  char value = sc.nextLine().toCharArray()[0];
  if(Character.isUpperCase(value))
    System.out.println('A');
  else
    System.out.println('a');
}
} Main
import java.util.*;

public class Main{
public static void main(String[] args){
  Scanner sc = new Scanner(System.in);
  char value = sc.nextLine().toCharArray()[0];
  if(Character.isUpperCase(value))
    System.out.println('A');
  else
    System.out.println('a');
}
}