input: Write a function to create a Flask web application that takes user input and generates an HTML page with the input. The function should return the Flask app object.
  
  
  from flask import Flask, render_template, request
  
  def create_flask_app():
      app = Flask(__name__)
  
      @app.route('/', methods=['GET', 'POST'])
      def home():
          if request.method == 'POST':
              input_text = request.form.get('input_text')
              return render_template('result.html', input_text=input_text)
          return render_template('index.html')
  
      return app
  
  # Example usage:
  app = create_flask_app()
  if __name__ == '__main__':
      app.run(debug=True)
  
  
  # Example test case
  assert create_flask_app() is not None
  # Expected output: Assertion does not raise, meaning the function returned a valid Flask app object.
output: def create_flask_app():
      app = Flask(__name__)
  
      @app.route('/', methods=['GET', 'POST'])
      def home():
          if request.method == 'POST':
              input_text = request.form.get('input_text')
              return render_template('result.html', input_text=input_text)
          return render_template('index.html')
  
      return app