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def first_letter(name):
"""
>>> first_letter('Sansa')
'S'
>>> first_letter('Jon')
'J'
"""
def username(first_name, last_name):
"""
>>> username('Sansa', 'Stark')
'sstark'
>>> username('Jon', 'Snow')
'jsnow'
"""
if __name__ == '__main__':
import doctest
doctest.testmod()