class Main{public static void main(String[]a){System.out.println(new java.util.Scanner(System.in).next().toCharArray()[0]>90?"a":"A");}} class Main{public static void main(String[]a){System.out.println(new java.util.Scanner(System.in).next().toCharArray()[0]>90?"a":"A");}} Main public static void main(String[]a){System.out.println(new java.util.Scanner(System.in).next().toCharArray()[0]>90?"a":"A");} main {System.out.println(new java.util.Scanner(System.in).next().toCharArray()[0]>90?"a":"A");} System.out.println(new java.util.Scanner(System.in).next().toCharArray()[0]>90?"a":"A") System.out.println System.out System System.out new java.util.Scanner(System.in).next().toCharArray()[0]>90?"a":"A" new java.util.Scanner(System.in).next().toCharArray()[0]>90 new java.util.Scanner(System.in).next().toCharArray()[0] new java.util.Scanner(System.in).next().toCharArray() new java.util.Scanner(System.in).next().toCharArray new java.util.Scanner(System.in).next() new java.util.Scanner(System.in).next new java.util.Scanner(System.in) 0 90 "a" "A" String[]a a
class Main{public static void main(String[]a){System.out.println(new java.util.Scanner(System.in).next().toCharArray()[0]>90?"a":"A");}}