#test 1 solution 

def validPlate(my_str):
	l_str = len(my_str)
	upper=False
	lower=False
	count_digit = 0
	other=False	
	
	if(l_str!=7):
		return False
	
	for i in range(l_str):
		
		if(my_str[i].islower()):
			lower = True
		elif(my_str[i].isupper()):
			upper = True
		elif(my_str[i].isdigit()):
			count_digit+=1
		else:
			other=True

	
	if(lower or other):
		return False
	
	last=my_str[l_str-1]
	first=my_str[0]

	if(upper):
		if(count_digit==6 and (last.isupper() or first=='I')):
			return False
		elif(count_digit==5 and last=='I' and first=='I'):
			return False
		else:
			return True

def main():
	my_str=input("enter string ")
	if(validPlate(my_str)):
		print("Valid")
	else:
		print("NOT VALID")
main()