input: Write a python function to train a Multinomial Naive Bayes classifier using Scikit-learn and make predictions.
  assert train_and_predict(X_train, y_train, X_test) == y_predicted
output: def train_and_predict(X_train, y_train, X_test):
      from sklearn.naive_bayes import MultinomialNB
      
      model = MultinomialNB()
      model.fit(X_train, y_train)
      
      y_predicted = model.predict(X_test)
      return y_predicted