
import java.util.Scanner;

public class Main {
	public static void main(String []args){
		//????????£?????????????????????
		Scanner sc = new Scanner(System.in);
		//
		//??????????????????
		String word = sc.nextLine();
		//????????????????????????????????´???
		String W = "";
		String R = "";
		for(int i = 0; i<word.length(); i++){
			//???????????????1??????????????????
			W = word.substring(i, i + 1);
			//System.out.println(i + "=" + W);
			//?????¶??? ?°???????????£???????
			if(W.equals(W.toLowerCase())){
			//?°????????????£????????§??????????????´
				W =W.toUpperCase();
				//?????¶??? ??§??????????£???????
			}else if (W.equals(W.toUpperCase())){
			//??§???????????£???????°???????????????´
				W = W.toLowerCase();
			}
			//???????????£???????????????????????????
			R += W;
		}
		//???????????¨???
		System.out.println(R);
	}
}
/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