import re

t=int(input)

f = 0
p = input("")
if len(p) < 8:
    f = 1
if not re.search('[a-z]', p):
    f = 1
if not re.search('[A-Z]', p):
    f = 1
if not re.search('[0-9]', p):
    f = 1
if not re.search('[!@#$%^&*()]', p):
    f = 1

if (f == 0):
    print("valid")
else:
    print("invalid")