adress = input()
possible_adress_http = ['h', 't', 't', 'p', ':', '/', '/']
possible_adress_https = ['h', 't', 't', 'p', 's', ':', '/', '/']
possible_domain = ['.', 'r', 'u']
possible_domain_two = ['.', 'r', 'u', '/']
letters_adress = list(adress)
if list(letters_adress[0:8]) == possible_adress_https or list(letters_adress[0:7]) == possible_adress_http:
if list(letters_adress[-3:]) == possible_domain or list(letters_adress[-4:]) == possible_domain_two:
print('yes')
else:
print('no')
