text: import boto3
  import os
  
  
  def fetch_decryption_key():
      s3_client = boto3.client('s3')
      bucket_name = os.environ['DECRYPTION_KEY_BUCKET_NAME']
      filename = os.environ['DECRYPTION_KEY_FILE_NAME']
      response = s3_client.get_object(Bucket=bucket_name, Key=filename)
      return response['Body'].read()
  
  def fetch_import_file(bucket_name, filename):
      s3_client = boto3.client('s3')
      response = s3_client.get_object(Bucket=bucket_name, Key=filename)
      return response['Body'].iter_lines()
  
  def delete_import_file(bucket_name, filename):
      s3_client = boto3.client('s3')
      s3_client.delete_object(Bucket=bucket_name, Key=filename)
  