How To Solve When I Using While Loop 2Nd Time Auto Skip Scanner

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Java

do {
            String sName;
            String sMission;
            
            System.out.printf("%-11s%-20s%10s\n", "*****", "Add the station in behind", "*****");
            System.out.print("Enter station name: ");
            sName = input.nextLine();
            System.out.flush();
            System.out.printf("%-15s\n%-15s\n%-15s\nYour Choice: ",
                    "Select station mission", "1.MCQ", "2.True/False Quiz");
            sMission = input.next();
            System.out.flush();

            if (sMission.equals("1")) {
                missionType = "|MCQ";
                r.addFront(sName + missionType);
            } else if (sMission.equals("2")) {
                missionType = "|Quiz";
                r.addFront(sName + missionType);
            } else {
                System.out.println("Invalid input must (1-2): ");
                Thread.sleep(2000);
                return;
            }
            //using overwrite to insert station
            File s = new File("Station.txt");

            try {
                if (s.exists() == false) {
                    s.createNewFile();
                }
                PrintWriter fw = new PrintWriter(s);
                fw.append(r.toString());//using toString to write to text file
                fw.close();
                System.out.println("Success to insert.");
            } catch (IOException e) {
                System.out.println("Could not create file");
            }
            System.out.printf("Continue(Y/N)?");
            selection = input.next();
        } while (selection.equals("y") || selection.equals("Y"));

Output:
***** Add the station in behind *****
Enter station name: Stt
Select station mission
1.MCQ
2.True/False Quiz
Your Choice: 1
Success to insert.
Continue(Y/N)?y
***** Add the station in behind *****
Enter station name: Select station mission //In here 2 while loop auto skip for enter station
1.MCQ
2.True/False Quiz
Your Choice: 3
Invalid input must (1-2):