# Enter your code here. Read input from STDIN. Print output to STDOUT
n=input()
ab=list(raw_input())
a1=1
a2=1
a3=1
a4=1
for i in ab:
    if i in list('1234567890'):
        a1=0
    if i in list('abcdefghijklmnopqrstuvwxyz'):
        a2=0
    if i in list('ABCDEFGHIJKLMNOPQRSTUVWXYZ'):
        a3=0
    if i in list('!@#$%^&*()-+'):
        a4=0

print max(6,n+a1+a2+a3+a4)-n