n=int(raw_input())
s=raw_input()
lis="1234567890"
uca,lca,num,sc=0,0,0,0
ans=0
for i in s:
    if ord(i)>=65 and ord(i)<=90:
        uca+=1
    if ord(i)>=97 and ord(i)<=122:
        lca+=1
    if i in lis:
        num+=1
    if ord(i)>=33 and ord(i)<=47:
        sc+=1
if n>=6:
    if uca==0:
        ans+=1
    if lca==0:
        ans+=1
    if num==0:
        ans+=1
    if sc==0:
        ans+=1
else:
    if uca==0:
        ans+=1
    if lca==0:
        ans+=1
    if num==0:
        ans+=1
    if sc==0:
        ans+=1
    if n+ans<6:
        ans+=6-n-ans
print ans