import java.io.*;
public class ReadIn{
	public static void main(String[] args){
		int len = 0;
		String s=new String();
		
		try{
		    System.out.println("Please enter string");
			BufferedReader br = new BufferedReader(
									new InputStreamReader(
										System.in));
			 s = br.readLine();
			
			System.out.println(s);
		}catch(Exception e){}
	len=s.length();
	StringBuffer strbuf=new StringBuffer(len);
	for (int j=0;j<=len-1;j++){
	   char c;
	   int i;
	   c=s.charAt(j);
	   i=c;
	   if (i>=65 & i<=90)
	      i=i+32;
	   else 
	      i=i-32;
	      c=(char)i;
	      strbuf.append(c);
	   }
    System.out.println(strbuf);     
	}	
}