n=int(input())

s=input()
l=u=d=sp=0
count=0
for i in s:
	if 97<=ord(i)<=122:
		l+=1
	elif 65<=ord(i)<=90:
		u+=1
	elif i.isdigit():
		d+=1
	elif i in "!@#$%^&*()-+":
		sp+=1
	
	if l>=1 and u>=1 and d>=1 and sp>=1:
		break

if l==0:
	count+=1
if u==0:
	count+=1
if d==0:
	count+=1
if sp==0:
	count+=1

if (len(s)+count)<6:
	print(count+(6-len(s)-count))
else:
	print(count)