import java.io.*;

// 処理
final class Process {
    private final String S;
    
    Process(final String S) {
        this.S = S;
    }
    
    // 結果を出力
    final void printResult(final PrintWriter printWriter) throws IOException {
        // 65: A, 90: Z
        
        for(int s = 0; s < S.length(); s++) {
            int charCode = (int)S.charAt(s) - (s + 1);
            if(charCode < 65) {
                while(charCode < 65) {
                    charCode += 26;
                }
            }
            
            printWriter.print((char)charCode);
        }
        printWriter.println();
    }
}

public class Main {
    public static void main(final String[] args) throws IOException {
        final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        final PrintWriter    printWriter    = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

        // 入力
        final String S = bufferedReader.readLine().trim();
        
        // Process クラスで処理を行う
        final Process process = new Process(S);
        process.printResult(printWriter);
        
        // 各ストリームを閉じる
        // 出力ストリームを閉じるときに標準出力に文字を出力する
        bufferedReader.close();
        printWriter.close();
    }
}