import sys
import re

def has_Dup(str):
  for i in range(len(str)-3):
    for j in range(i+1, len(str)-3):
      if str[i:i+3] == str[j:j+3]:
        return True

def check_pwd(pwd):
  if len(pwd) <= 8 or has_Dup(pwd):
    return False
  count = 0
  if re.search('[0-9]', pwd):
    count += 1
  if re.search('[a-z]', pwd):
    count += 1
  if re.search('[A-Z]', pwd):
    count += 1
  if re.search('\W', pwd):
    count += 1
  if count >= 3:
    return True
pwdList = sys.stdin.readlines()
for x in pwdList:
  x = x.strip()
  if check_pwd(x):
    print('OK')
  else:
    print('NG')