# 1707.py

a='  libro  '
print '[%s]' %(a.strip())
# [libro]

print '[%s]' %(a.lstrip())
# [libro  ]

print '[%s]' %(a.rstrip())
# [  libro]

b='aei terra iia'
print '[%s]' %(b.strip('eia'))
# [ terra ]

c='gente'
print '[%s]' %(c.rjust(7))
# [  gente]