import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try(Scanner sc = new Scanner(System.in)) {
            System.out.println(new Main().run(sc));
        }
    }

    public String run(Scanner sc) {
        String a = sc.nextLine();
        String lowercase = a.toLowerCase();
        return a.equals(lowercase) ? "a" : "A";
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        try(Scanner sc = new Scanner(System.in)) {
            System.out.println(new Main().run(sc));
        }
    }

    public String run(Scanner sc) {
        String a = sc.nextLine();
        String lowercase = a.toLowerCase();
        return a.equals(lowercase) ? "a" : "A";
    }
} Main public static void main(String[] args) {
        try(Scanner sc = new Scanner(System.in)) {
            System.out.println(new Main().run(sc));
        }
    } main {
        try(Scanner sc = new Scanner(System.in)) {
            System.out.println(new Main().run(sc));
        }
    } try(Scanner sc = new Scanner(System.in)) {
            System.out.println(new Main().run(sc));
        } {
            System.out.println(new Main().run(sc));
        } Scanner sc = new Scanner(System.in) Scanner sc = new Scanner(System.in) new Scanner(System.in) System.out.println(new Main().run(sc)) System.out.println System.out System System.out new Main().run(sc) new Main().run new Main() sc String[] args args public String run(Scanner sc) {
        String a = sc.nextLine();
        String lowercase = a.toLowerCase();
        return a.equals(lowercase) ? "a" : "A";
    } run {
        String a = sc.nextLine();
        String lowercase = a.toLowerCase();
        return a.equals(lowercase) ? "a" : "A";
    } String a = sc.nextLine(); a sc.nextLine() sc.nextLine sc String lowercase = a.toLowerCase(); lowercase a.toLowerCase() a.toLowerCase a return a.equals(lowercase) ? "a" : "A"; a.equals(lowercase) ? "a" : "A" a.equals(lowercase) a.equals a lowercase "a" "A" Scanner sc sc public class Main {
    public static void main(String[] args) {
        try(Scanner sc = new Scanner(System.in)) {
            System.out.println(new Main().run(sc));
        }
    }

    public String run(Scanner sc) {
        String a = sc.nextLine();
        String lowercase = a.toLowerCase();
        return a.equals(lowercase) ? "a" : "A";
    }
} public class Main {
    public static void main(String[] args) {
        try(Scanner sc = new Scanner(System.in)) {
            System.out.println(new Main().run(sc));
        }
    }

    public String run(Scanner sc) {
        String a = sc.nextLine();
        String lowercase = a.toLowerCase();
        return a.equals(lowercase) ? "a" : "A";
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        try(Scanner sc = new Scanner(System.in)) {
            System.out.println(new Main().run(sc));
        }
    }

    public String run(Scanner sc) {
        String a = sc.nextLine();
        String lowercase = a.toLowerCase();
        return a.equals(lowercase) ? "a" : "A";
    }
}
