import java.util.*;

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

public class Main {
 
	public static void main(String[] args) {
      Scanner sr = new Scanner(System.in);
      String str = sr.next();
      if(Character.isUpperCase(str.charAt(0)))
        System.out.println( "A" );
      else 
        System.out.println( "a" );
	}
}