import java.io.*;

// 処理
class Process {
    private String S;

    Process(String S) {
        this.S = S;
    }

    char getResult() {
        String str = "yukicoder";
        for(int i = 0; i < S.length(); i++) {
            if(S.charAt(i) == '?') {
                return str.charAt(i);
            }
        }

        return ' ';
    }
}

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

        // 入力
        String S = bufferedReader.readLine().trim();

        // 出力
        printWriter.println((new Process(S)).getResult());

        bufferedReader.close();
        printWriter.close();
    }
}