while True:
cpf = input('Digite os nove primeiros dígitos do CPF: ')
if len(cpf) !=9:
break
else:
Print(cpf)
continue
#http://pt.stackoverflow.com/q/187587/101
d2hpbGUgVHJ1ZToKICAgIGNwZiA9IGlucHV0KCdEaWdpdGUgb3Mgbm92ZSBwcmltZWlyb3MgZMOtZ2l0b3MgZG8gQ1BGOiAnKQogICAgaWYgbGVuKGNwZikgIT05OgogICAgICAgIGJyZWFrCiAgICBlbHNlOgogICAgICAgIFByaW50KGNwZikKICAgICAgICBjb250aW51ZQoKI2h0dHA6Ly9wdC5zdGFja292ZXJmbG93LmNvbS9xLzE4NzU4Ny8xMDE=