Trithemius_cipher

public class Cipher {
//    private int smesh = (int)'a';
    String Alph = "абвгдеёжзийклмнопрстуфхцчшщъыьэюя"; 
    public String  enc (String  text){
        StringBuilder ans = new StringBuilder();
        for (int i=0; i<text.length();i++){
            String[] m = text.split("");
            String element = m[i];
            int num = Alph.indexOf(element)+i;
           char a = (char) Alph.charAt(num);
            ans.append(a);
        }
        return ans.toString();
    }
    public String desc (String s){
        StringBuilder san = new StringBuilder();
        for (int i=0; i<s.length(); i++){
            String[] n = s.split("");
            String element = n[i];
            int num = Alph.indexOf(element)-i;
            char a = (char) Alph.charAt(num);
            san.append(a);
        }
        return san.toString();
    }
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner scan = new Scanner(System.in, "CP1251");
        Cipher mr = new Cipher();
        System.out.println("Введите слово\n");
        String s = scan.nextLine();
        String enc = mr.enc(s);
        System.out.println("Зашифрованное\n"+enc);
        String desc = mr.desc(enc);
        System.out.println("Расшифрованное\n"+desc);
    }
    
}