import re
string = input( )
pattern = re.compile("^\w{1,16}@(\w{1,16}\.)*\w{1,16}(|/\w{1,16})$")
if pattern.match( string ) :
print( "YES" )
else :
print( "NO" )
1476A - K-divisible Sum | 1333A - Little Artem |
432D - Prefixes and Suffixes | 486A - Calculating Function |
1373B - 01 Game | 1187A - Stickers and Toys |
313B - Ilya and Queries | 579A - Raising Bacteria |
723A - The New Year Meeting Friends | 302A - Eugeny and Array |
1638B - Odd Swap Sort | 1370C - Number Game |
1206B - Make Product Equal One | 131A - cAPS lOCK |
1635A - Min Or Sum | 474A - Keyboard |
1343A - Candies | 1343C - Alternating Subsequence |
1325A - EhAb AnD gCd | 746A - Compote |
318A - Even Odds | 550B - Preparing Olympiad |
939B - Hamster Farm | 732A - Buy a Shovel |
1220C - Substring Game in the Lesson | 452A - Eevee |
1647B - Madoka and the Elegant Gift | 1408A - Circle Coloring |
766B - Mahmoud and a Triangle | 1618C - Paint the Array |