    import java.util.Scanner;
     
    public class Main {
     
        public static void main(String[] args) {
            @SuppressWarnings("resource")
            Scanner sc = new Scanner(System.in);
            char c = sc.next().toCharArray()[0];
            System.out.println(c >= 'a' ? 'a' : 'A');
        }
     
    } import java.util.Scanner; Scanner java.util public class Main {
     
        public static void main(String[] args) {
            @SuppressWarnings("resource")
            Scanner sc = new Scanner(System.in);
            char c = sc.next().toCharArray()[0];
            System.out.println(c >= 'a' ? 'a' : 'A');
        }
     
    } Main public static void main(String[] args) {
            @SuppressWarnings("resource")
            Scanner sc = new Scanner(System.in);
            char c = sc.next().toCharArray()[0];
            System.out.println(c >= 'a' ? 'a' : 'A');
        } main {
            @SuppressWarnings("resource")
            Scanner sc = new Scanner(System.in);
            char c = sc.next().toCharArray()[0];
            System.out.println(c >= 'a' ? 'a' : 'A');
        } @SuppressWarnings("resource")
            Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char c = sc.next().toCharArray()[0]; c sc.next().toCharArray()[0] sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc 0 System.out.println(c >= 'a' ? 'a' : 'A') System.out.println System.out System System.out c >= 'a' ? 'a' : 'A' c >= 'a' c 'a' 'a' 'A' String[] args args public class Main {
     
        public static void main(String[] args) {
            @SuppressWarnings("resource")
            Scanner sc = new Scanner(System.in);
            char c = sc.next().toCharArray()[0];
            System.out.println(c >= 'a' ? 'a' : 'A');
        }
     
    } public class Main {
     
        public static void main(String[] args) {
            @SuppressWarnings("resource")
            Scanner sc = new Scanner(System.in);
            char c = sc.next().toCharArray()[0];
            System.out.println(c >= 'a' ? 'a' : 'A');
        }
     
    } Main
    import java.util.Scanner;
     
    public class Main {
     
        public static void main(String[] args) {
            @SuppressWarnings("resource")
            Scanner sc = new Scanner(System.in);
            char c = sc.next().toCharArray()[0];
            System.out.println(c >= 'a' ? 'a' : 'A');
        }
     
    }