import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    a();
  }

  public static void a() {
    try (Scanner sc = new Scanner(System.in)) {

      char al = sc.next().charAt(0);
      if (Character.isUpperCase(al)) {
        System.out.println("A");
      } else {
        System.out.println("a");
      }

    } catch (Exception e) {
      System.out.println("エラー" + e);
    }
  }
} import java.util.Arrays; Arrays java.util import java.util.List; List java.util import java.util.Scanner; Scanner java.util public class Main {
  public static void main(String[] args) {
    a();
  }

  public static void a() {
    try (Scanner sc = new Scanner(System.in)) {

      char al = sc.next().charAt(0);
      if (Character.isUpperCase(al)) {
        System.out.println("A");
      } else {
        System.out.println("a");
      }

    } catch (Exception e) {
      System.out.println("エラー" + e);
    }
  }
} Main public static void main(String[] args) {
    a();
  } main {
    a();
  } a() a String[] args args public static void a() {
    try (Scanner sc = new Scanner(System.in)) {

      char al = sc.next().charAt(0);
      if (Character.isUpperCase(al)) {
        System.out.println("A");
      } else {
        System.out.println("a");
      }

    } catch (Exception e) {
      System.out.println("エラー" + e);
    }
  } a {
    try (Scanner sc = new Scanner(System.in)) {

      char al = sc.next().charAt(0);
      if (Character.isUpperCase(al)) {
        System.out.println("A");
      } else {
        System.out.println("a");
      }

    } catch (Exception e) {
      System.out.println("エラー" + e);
    }
  } try (Scanner sc = new Scanner(System.in)) {

      char al = sc.next().charAt(0);
      if (Character.isUpperCase(al)) {
        System.out.println("A");
      } else {
        System.out.println("a");
      }

    } catch (Exception e) {
      System.out.println("エラー" + e);
    } catch (Exception e) {
      System.out.println("エラー" + e);
    } Exception e {
      System.out.println("エラー" + e);
    } System.out.println("エラー" + e) System.out.println System.out System System.out "エラー" + e "エラー" e {

      char al = sc.next().charAt(0);
      if (Character.isUpperCase(al)) {
        System.out.println("A");
      } else {
        System.out.println("a");
      }

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

  public static void a() {
    try (Scanner sc = new Scanner(System.in)) {

      char al = sc.next().charAt(0);
      if (Character.isUpperCase(al)) {
        System.out.println("A");
      } else {
        System.out.println("a");
      }

    } catch (Exception e) {
      System.out.println("エラー" + e);
    }
  }
} public class Main {
  public static void main(String[] args) {
    a();
  }

  public static void a() {
    try (Scanner sc = new Scanner(System.in)) {

      char al = sc.next().charAt(0);
      if (Character.isUpperCase(al)) {
        System.out.println("A");
      } else {
        System.out.println("a");
      }

    } catch (Exception e) {
      System.out.println("エラー" + e);
    }
  }
} Main
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    a();
  }

  public static void a() {
    try (Scanner sc = new Scanner(System.in)) {

      char al = sc.next().charAt(0);
      if (Character.isUpperCase(al)) {
        System.out.println("A");
      } else {
        System.out.println("a");
      }

    } catch (Exception e) {
      System.out.println("エラー" + e);
    }
  }
}