import re

text = input()

regex = r"(^|(?<=\s))([a-z0-9]+)([\.\-\_]{1}[a-z0-9]+)*(@)([a-z]+)(-[a-z]+)*(\.[a-z]+)+"

emails = re.findall(regex, text)


for i in range(len(emails)):
    emails[i] = "".join(emails[i])

for s in emails:
    print(s)