n=int(input())
s=input()
ans=0
ans+=4
for i in s:
    if i in "0123456789":
        ans-=1
        break
for i in s:
    if i in "abcdefghijklmnopqrstuvwxyz":
        ans-=1
        break
for i in s:
    if i in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
        ans-=1
        break
for i in s:
    if i in "!@#$%^&*()-+":
        ans-=1
        break
if ans+n<6:
    ans=6-n
print(ans)