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def get_input( prompt ):
value = input( prompt )
for letter in value:
if letter < 'a' or letter > 'z':
print( "Invalid answer!")
value = get_input( prompt ) # DO NOT DO THIS!
return value
s = get_input( "Give a string of lower case letters: " )
print( "The user entered:", s )
Python sandbox
This window allows you to run Python code without installing a thing. The code you write here is not automatically submitted to Dodona.