n = int(input())
s = input()
numbers = "0123456789"
lower_case = "abcdefghijklmnopqrstuvwxyz"
upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
special_characters = "!@#$%^&*()-+"
nc = False
loc = False
upc = False
spc = False
for e in s:
    if e in numbers:
        nc = True
        pass
    if e in lower_case:
        loc = True
        pass
    if e in upper_case:
        upc = True
        pass
    if e in special_characters:
        spc = True
        pass
    pass
t = 0
if not nc:
    t+=1
    pass
if not loc:
    t+=1
    pass
if not upc:
    t+=1
    pass
if not spc:
    t+=1
    pass
if n+t<6:
    t+=6-n-t
    pass
print(t)