n=int(input())
s=input()
numbers = "0123456789"
lower_case = "abcdefghijklmnopqrstuvwxyz"
upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
special_characters = "!@#$%^&*()-+"
c=0
flag=True
for x in s :
	if(x in numbers):
		flag=False
		break
if(flag):
	c+=1

flag=True
for x in s :
	if(x in lower_case):
		flag=False
		break
if(flag):
	c+=1

flag=True
for x in s :
	if(x in upper_case):
		flag=False
		break
if(flag):
	c+=1

flag=True
for x in s :
	if(x in special_characters):
		flag=False
		break
if(flag):
	c+=1

if(n<6 and (n+c)<6):
    c=6-n

print(c)