public class Cipher{
public String runCipher(String s, int n){
String result = "";
int k = 0;
s = s.toLowerCase();
for (int i = 0; i < s.length(); i ++){
if (s.charAt(i) + n <= 'z'){
result = result + (char)(s.charAt(i) + n);
}
if (s.charAt(i) + n > 'z'){
k = 'z' - s.charAt(i);
k = n - k - 1;
result = result + (char)('a' + k);
}
}
return result;
}
}