import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		String a = sc.nextLine();
      	String A = ("A");
		if(a.equals("A")){
        	System.out.println(A);
        }
		else if(a.equals("B")){
        	System.out.println(A);
        }
		else if(a.equals("C")){
        	System.out.println(A);
        }
		else if(a.equals("D")){
        	System.out.println(A);
        }
		else if(a.equals("E")){
        	System.out.println(A);
        }
		else if(a.equals("F")){
        	System.out.println(A);
        }
		else if(a.equals("G")){
        	System.out.println(A);
        }
		else if(a.equals("H")){
        	System.out.println(A);
        }
		else if(a.equals("I")){
        	System.out.println(A);
        }
		else if(a.equals("J")){
        	System.out.println(A);
        }
		else if(a.equals("K")){
        	System.out.println(A);
        }
		else if(a.equals("L")){
        	System.out.println(A);
        }
		else if(a.equals("M")){
        	System.out.println(A);
        }
		else if(a.equals("N")){
        	System.out.println(A);
        }
		else if(a.equals("O")){
        	System.out.println(A);
        }
		else if(a.equals("P")){
        	System.out.println(A);
        }
		else if(a.equals("Q")){
        	System.out.println(A);
        }
		else if(a.equals("R")){
        	System.out.println(A);
        }
		else if(a.equals("S")){
        	System.out.println(A);
        }
		else if(a.equals("T")){
        	System.out.println(A);
        }
		else if(a.equals("U")){
        	System.out.println(A);
        }
		else if(a.equals("V")){
        	System.out.println(A);
        }
		else if(a.equals("W")){
        	System.out.println(A);
        }
		else if(a.equals("X")){
        	System.out.println(A);
        }
		else if(a.equals("Y")){
        	System.out.println(A);
        }
		else if(a.equals("Z")){
        	System.out.println(A);
        }
      	else{
        	System.out.println("a");
        }
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz