import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Question18 {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String line;

		try{
			line = in.readLine();
		}catch(IOException e){
			System.out.println("-1");
			return;
		}

		int max = line.length();
		StringBuffer result = new StringBuffer();

		for(int i = 0; i < max; i++){
			int x = (i + 1) % 26;
			int d = line.charAt(i) - 65;
			char c = (char)(65+(d - x + 26)%26);
			result.append(c);
		}

		System.out.println(result.toString());
	}

}