import java.util.*;
class Main{
  public static void main(String[]args){
    Scanner sc=new Scanner(System.in);
    String a=sc.next();
    if(Character.isUpperCase(a.charAt(0))) System.out.printf("A");
    else System.out.printf("a");
  }
} import java.util.*; util.* java class Main{
  public static void main(String[]args){
    Scanner sc=new Scanner(System.in);
    String a=sc.next();
    if(Character.isUpperCase(a.charAt(0))) System.out.printf("A");
    else System.out.printf("a");
  }
} Main public static void main(String[]args){
    Scanner sc=new Scanner(System.in);
    String a=sc.next();
    if(Character.isUpperCase(a.charAt(0))) System.out.printf("A");
    else System.out.printf("a");
  } main {
    Scanner sc=new Scanner(System.in);
    String a=sc.next();
    if(Character.isUpperCase(a.charAt(0))) System.out.printf("A");
    else System.out.printf("a");
  } Scanner sc=new Scanner(System.in); sc new Scanner(System.in) String a=sc.next(); a sc.next() sc.next sc if(Character.isUpperCase(a.charAt(0))) System.out.printf("A");
    else System.out.printf("a"); Character.isUpperCase(a.charAt(0)) Character.isUpperCase Character a.charAt(0) a.charAt a 0 System.out.printf("A") System.out.printf System.out System System.out "A" System.out.printf("a") System.out.printf System.out System System.out "a" String[]args args
import java.util.*;
class Main{
  public static void main(String[]args){
    Scanner sc=new Scanner(System.in);
    String a=sc.next();
    if(Character.isUpperCase(a.charAt(0))) System.out.printf("A");
    else System.out.printf("a");
  }
}