import java.util.*;

public class Transform {
    public String trans(String s, int n) {
        StringBuilder str=new StringBuilder();
		String[] arr=s.split(" ");
        if (s.lastIndexOf(" ")==s.length()-1) {
			str.append(" ");
		}
		for (int i = arr.length-1; i >=0 ; i--) {
			for (int j = 0; j < arr[i].length(); j++) {
				String c=arr[i].charAt(j)+"";
				if (Character.isLowerCase(arr[i].charAt(j))) {					
					str.append(c.toUpperCase());
				}else {
					str.append(c.toLowerCase());
				}
			}
			if (i!=0) {
				str.append(" ");
			}
		}
        return str.toString();
    }
}