???????????????????

??????ж?????????????????????趨?????????????????

??????????????Gmail?????????????????д??????????????????@gmail.com

????only letters (a-z)?? numbers (0-9)?? and periods (.)  is allowed??

????the first character of your username must be an ascii letter (a-z) or number (0-9)

????username must be between 6 and 30 characters long

??????Ч????????￡?

????(1)???????????"a-z"??"0-9"?? ".??????????   eg.#!12#??ewewe

????(2)?????????? С??6??????30?????   eg. werw?? wew...

????(3)??????????"."????    eg. .test

????---------------

???????????ó?????д?????ж???????????Ч????????ж????????

????(1)@(2).(3)

????(1)????????????????5??100

????(???????????????????????????????"_"???????????????;?е????仹??????????????????????????????в???????????????????????????)

????(2)????????????????1??30

????(3)????????????????2??67

????[(2)??(3)????????????????????????

????????????????????26???????10??????????????????("-")??????????????????????????????????????????????...]

????(4)???????@????

????(5)???????.

????(6)@?????????*.*????(*??????????)

????(7)???????????"_"?????????????????

??????Ч?????

??????????(1)/(2)/(3)/(4)/(5)/(6)/(7)

??????????(1)(2)/(1)(3)/(1)(4)/(1)(5)/(1)(6)/(1)(7)

??????????(2)(3)/(2)(4)/(2)(5)/(2)(6)/(2)(7)

???????? ??????????????? eg. ?д????????

????????????????????????????????????....

??????????????????????

????1) ??@??.????

????a. @??.???????????

????b. ?????????λ??@??.

????c. ?????????λ??@??.

????c. ??@??.????????????????

????2) ???@??.????

????3) @/.????????????

????4) ??@@???????

????5) ??..???????