import java.util.*;


public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String line = sc.nextLine();

        if(line.equals("a")||
        line.equals("b")||
        line.equals("c")||
        line.equals("d")||
        line.equals("e")||
        line.equals("f")||
        line.equals("g")||
        line.equals("h")||
        line.equals("i")||
        line.equals("j")||
        line.equals("k")||
        line.equals("l")||
        line.equals("m")||
        line.equals("n")||
        line.equals("o")||
        line.equals("p")||
        line.equals("q")||
        line.equals("r")||
        line.equals("s")||
        line.equals("t")||
        line.equals("u")||
        line.equals("v")||
        line.equals("w")||
        line.equals("x")||
        line.equals("y")||
        line.equals("z")){
          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);
        String line = sc.nextLine();

        if(line.equals("a")||
        line.equals("b")||
        line.equals("c")||
        line.equals("d")||
        line.equals("e")||
        line.equals("f")||
        line.equals("g")||
        line.equals("h")||
        line.equals("i")||
        line.equals("j")||
        line.equals("k")||
        line.equals("l")||
        line.equals("m")||
        line.equals("n")||
        line.equals("o")||
        line.equals("p")||
        line.equals("q")||
        line.equals("r")||
        line.equals("s")||
        line.equals("t")||
        line.equals("u")||
        line.equals("v")||
        line.equals("w")||
        line.equals("x")||
        line.equals("y")||
        line.equals("z")){
          System.out.println("a");
        }else{
          System.out.println("A");
        }
      
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String line = sc.nextLine();

        if(line.equals("a")||
        line.equals("b")||
        line.equals("c")||
        line.equals("d")||
        line.equals("e")||
        line.equals("f")||
        line.equals("g")||
        line.equals("h")||
        line.equals("i")||
        line.equals("j")||
        line.equals("k")||
        line.equals("l")||
        line.equals("m")||
        line.equals("n")||
        line.equals("o")||
        line.equals("p")||
        line.equals("q")||
        line.equals("r")||
        line.equals("s")||
        line.equals("t")||
        line.equals("u")||
        line.equals("v")||
        line.equals("w")||
        line.equals("x")||
        line.equals("y")||
        line.equals("z")){
          System.out.println("a");
        }else{
          System.out.println("A");
        }
      
    } main {
        Scanner sc = new Scanner(System.in);
        String line = sc.nextLine();

        if(line.equals("a")||
        line.equals("b")||
        line.equals("c")||
        line.equals("d")||
        line.equals("e")||
        line.equals("f")||
        line.equals("g")||
        line.equals("h")||
        line.equals("i")||
        line.equals("j")||
        line.equals("k")||
        line.equals("l")||
        line.equals("m")||
        line.equals("n")||
        line.equals("o")||
        line.equals("p")||
        line.equals("q")||
        line.equals("r")||
        line.equals("s")||
        line.equals("t")||
        line.equals("u")||
        line.equals("v")||
        line.equals("w")||
        line.equals("x")||
        line.equals("y")||
        line.equals("z")){
          System.out.println("a");
        }else{
          System.out.println("A");
        }
      
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String line = sc.nextLine(); line sc.nextLine() sc.nextLine sc if(line.equals("a")||
        line.equals("b")||
        line.equals("c")||
        line.equals("d")||
        line.equals("e")||
        line.equals("f")||
        line.equals("g")||
        line.equals("h")||
        line.equals("i")||
        line.equals("j")||
        line.equals("k")||
        line.equals("l")||
        line.equals("m")||
        line.equals("n")||
        line.equals("o")||
        line.equals("p")||
        line.equals("q")||
        line.equals("r")||
        line.equals("s")||
        line.equals("t")||
        line.equals("u")||
        line.equals("v")||
        line.equals("w")||
        line.equals("x")||
        line.equals("y")||
        line.equals("z")){
          System.out.println("a");
        }else{
          System.out.println("A");
        } line.equals("a")||
        line.equals("b")||
        line.equals("c")||
        line.equals("d")||
        line.equals("e")||
        line.equals("f")||
        line.equals("g")||
        line.equals("h")||
        line.equals("i")||
        line.equals("j")||
        line.equals("k")||
        line.equals("l")||
        line.equals("m")||
        line.equals("n")||
        line.equals("o")||
        line.equals("p")||
        line.equals("q")||
        line.equals("r")||
        line.equals("s")||
        line.equals("t")||
        line.equals("u")||
        line.equals("v")||
        line.equals("w")||
        line.equals("x")||
        line.equals("y")||
        line.equals("z") line.equals("y") line.equals("x") line.equals("w") line.equals("v") line.equals("u") line.equals("t") line.equals("s") line.equals("r") line.equals("q") line.equals("p") line.equals("o") line.equals("n") line.equals("m") line.equals("l") line.equals("k") line.equals("j") line.equals("i") line.equals("h") line.equals("g") line.equals("f") line.equals("e") line.equals("d") line.equals("c") line.equals("a")||
        line.equals("b")||
        line.equals("c")||
        line.equals("d")||
        line.equals("e")||
        line.equals("f")||
        line.equals("g")||
        line.equals("h")||
        line.equals("i")||
        line.equals("j")||
        line.equals("k")||
        line.equals("l")||
        line.equals("m")||
        line.equals("n")||
        line.equals("o")||
        line.equals("p")||
        line.equals("q")||
        line.equals("r")||
        line.equals("s")||
        line.equals("t")||
        line.equals("u")||
        line.equals("v")||
        line.equals("w")||
        line.equals("x")||
        line.equals("y")||
        line.equals("z") line.equals("a") line.equals line "a" line.equals("b") line.equals line "b" line.equals("c") line.equals line "c" line.equals("d") line.equals line "d" line.equals("e") line.equals line "e" line.equals("f") line.equals line "f" line.equals("g") line.equals line "g" line.equals("h") line.equals line "h" line.equals("i") line.equals line "i" line.equals("j") line.equals line "j" line.equals("k") line.equals line "k" line.equals("l") line.equals line "l" line.equals("m") line.equals line "m" line.equals("n") line.equals line "n" line.equals("o") line.equals line "o" line.equals("p") line.equals line "p" line.equals("q") line.equals line "q" line.equals("r") line.equals line "r" line.equals("s") line.equals line "s" line.equals("t") line.equals line "t" line.equals("u") line.equals line "u" line.equals("v") line.equals line "v" line.equals("w") line.equals line "w" line.equals("x") line.equals line "x" line.equals("y") line.equals line "y" line.equals("z") line.equals line "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 public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String line = sc.nextLine();

        if(line.equals("a")||
        line.equals("b")||
        line.equals("c")||
        line.equals("d")||
        line.equals("e")||
        line.equals("f")||
        line.equals("g")||
        line.equals("h")||
        line.equals("i")||
        line.equals("j")||
        line.equals("k")||
        line.equals("l")||
        line.equals("m")||
        line.equals("n")||
        line.equals("o")||
        line.equals("p")||
        line.equals("q")||
        line.equals("r")||
        line.equals("s")||
        line.equals("t")||
        line.equals("u")||
        line.equals("v")||
        line.equals("w")||
        line.equals("x")||
        line.equals("y")||
        line.equals("z")){
          System.out.println("a");
        }else{
          System.out.println("A");
        }
      
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String line = sc.nextLine();

        if(line.equals("a")||
        line.equals("b")||
        line.equals("c")||
        line.equals("d")||
        line.equals("e")||
        line.equals("f")||
        line.equals("g")||
        line.equals("h")||
        line.equals("i")||
        line.equals("j")||
        line.equals("k")||
        line.equals("l")||
        line.equals("m")||
        line.equals("n")||
        line.equals("o")||
        line.equals("p")||
        line.equals("q")||
        line.equals("r")||
        line.equals("s")||
        line.equals("t")||
        line.equals("u")||
        line.equals("v")||
        line.equals("w")||
        line.equals("x")||
        line.equals("y")||
        line.equals("z")){
          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);
        String line = sc.nextLine();

        if(line.equals("a")||
        line.equals("b")||
        line.equals("c")||
        line.equals("d")||
        line.equals("e")||
        line.equals("f")||
        line.equals("g")||
        line.equals("h")||
        line.equals("i")||
        line.equals("j")||
        line.equals("k")||
        line.equals("l")||
        line.equals("m")||
        line.equals("n")||
        line.equals("o")||
        line.equals("p")||
        line.equals("q")||
        line.equals("r")||
        line.equals("s")||
        line.equals("t")||
        line.equals("u")||
        line.equals("v")||
        line.equals("w")||
        line.equals("x")||
        line.equals("y")||
        line.equals("z")){
          System.out.println("a");
        }else{
          System.out.println("A");
        }
      
    }
}

