import java.util.Scanner;
 
class RegistoDeMensagem4 {
 
    private static int lerNumero(Scanner kb, String mensagem, String mensagemErro) {
        while (true) {
            System.out.println(mensagem);
            try {
                return Integer.parseInt(kb.nextLine());
            } catch (NumberFormatException e) {
                System.out.println(mensagemErro);
            }
        }
    }
 
    private static boolean lerSimNao(Scanner kb, String mensagem, String mensagemErro) {
        while (true) {
            System.out.println(mensagem);
            String x = kb.nextLine();
            if (x.equalsIgnoreCase("S")) return true;
            if (x.equalsIgnoreCase("N")) return false;
            System.out.println(mensagemErro);
        }
    }
 
    public static void main(String[] args) {
    	Scanner kb = new Scanner(System.in);
 
        System.out.println("Bem-vindo, utilizador.");
        boolean maisRecarga = true;
        while (maisRecarga) {
            int recarga = lerNumero(kb, "Introduza o número da recarga: ", "Isso que você digitou não era um número. Por favor, tente novamente.");
            System.out.println("Você digitou " + recarga + ".");
            maisRecarga = lerSimNao(kb, "Tem mais recarga para registar?\nResponda `S´ para continuar ou `N´ para terminar: ", "Era para você responder S ou N! Por favor, tente novamente.");
        }
        System.out.println("Obrigado, até o próximo registro.");
    }
}

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MTIzNApTCkJhbmFuYQo0MzIxCkoKbgo=

1234
S
Banana
4321
J
n