import java.util.*;

public class UsaCord {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        String InputText =scanner.next(); //暗号化する文字列
        String CipherText = ""; //暗号化後のデータ格納
        int RepetitionNumber = 0; //繰り返し数の定義
       
         for(int i=0 ; i<InputText.length() ; i++){
            RepetitionNumber = i + 1;
            
            char no = (char) RepetitionNumber; //繰り返し数だけ文字をずらす
            int num = InputText.charAt(i) - no;
            while(num <= 64){
                num = num + 26;
            }
            CipherText = CipherText + 
                    ((char)num);  
         }           
        System.out.println(CipherText);
    }
}