import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
        String s1 = sc.nextLine();
        
        sc.close();
        
        String[] strArray1 = new String[s1.length()];
        String[] strArray2 = new String[s1.length()];
        for (int i = 0; i < s1.length(); i++) {
        strArray1[i] = String.valueOf(s1.charAt(i));
        }
        for (int i = 0; i < s1.length(); i++) {
        strArray2[i] = String.valueOf(s1.charAt(i)).toLowerCase();
        }
        for (int i = 0; i < s1.length(); i++) {
            if(strArray1[i].equals(strArray2[i])){
                strArray2[i] = strArray1[i].toUpperCase();
            }
            
        }
        for (int i = 0; i < strArray1.length; i++) {
        System.out.print(strArray2[i]);
        }
        System.out.println();

	}

}


/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