numbers = "0123456789"
lower_case = "abcdefghijklmnopqrstuvwxyz"
upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
special_characters = "!@#$%^&*()-+"
l = input()
s = input()

ans = 0
done = 0
for i in s:
    if i in numbers:
        done = 1
if done == 0:
    ans+=1


done = 0
for i in s:
    if i in lower_case:
        done = 1
if done == 0:
    ans+=1


done = 0
for i in s:
    if i in upper_case:
        done = 1
if done == 0:
    ans+=1


done = 0
for i in s:
    if i in special_characters:
        done = 1
if done == 0:
    ans+=1


if len(s)+ans < 6:
    ans += 6-len(s)-ans
print(ans)