input: Write a function to create a web application in Python using Flask that will take user input and generate an HTML page with the input. The function should return the Flask application 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
  
  assert hasattr(create_flask_app(), 'route')==True
  assert create_flask_app().name=='__main__'
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