class Program01 {
	public static String rot13(String input) {
		StringBuilder output = new StringBuilder();
		for(int i=0;i<input.length();i++) {
			char ch = input.charAt(i);
			if(ch >= 'a' && ch <= 'm') {
				output.append((char)(ch + 13));
			}else if(ch >= 'n' && ch <= 'z') {
				output.append((char)(ch - 13));
			}else if(ch >= 'A' && ch <= 'M') {
				output.append((char)(ch + 13));
			}else if(ch >= 'N' && ch <= 'Z') {
				output.append((char)(ch - 13));
			}else {
				output.append(ch);
			}
		}
		return output.toString();
	}
	public static void main(String[] args) {
		System.out.println(rot13("titkos fogadas"));
	}
}