public class Encode{
public String encode(String s, int a){
String word = "";
for (int i=0;i<s.length();i++){
char c = s.charAt(i);
c = (char)((int)c + a);
if ((int)c > (int)'z'){
c = (char)((int)c - 26);
}
word = word + c;
}
return word;
}
}