text: from flask_wtf import Form
  from wtforms.validators import Required
  from wtforms import TextField, IntegerField, SubmitField
  
  class InputForm(Form):
      ticker_symbol = TextField(
          label='Ticker Symbol', validators=[Required()])
      start = IntegerField(
          label='Start Year', default='', validators=[Required()])
      end = IntegerField(
          label='End Year', default='', validators=[Required()])
      submit = SubmitField('Submit')
  