import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Scanner;

class Main{
    private static final InputStreamReader ir = new InputStreamReader(System.in);
    private static final PrintWriter out = new PrintWriter(System.out);
    public static void main(String[] Args) throws IOException{
        int in;
        while( (in = ir.read())!=-1){
            if(Character.isLowerCase(in)) out.write(Character.toUpperCase(in));
            else if(Character.isUpperCase(in)) out.write(Character.toLowerCase(in));
            else out.write(in);
        }
        out.flush();
    }
}
/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