# Store length of each row in survey_response column
resp_length = airlines['survey_response'].str.len()
# Find rows in airlines where resp_length > 40
airlines_survey = airlines[resp_length > 40]
# Assert minimum survey_response length is > 40
assert airlines_survey['survey_response'].str.len().min() > 40
# Print new survey_response column
print(airlines_survey['survey_response'])