n=int(raw_input())

x= raw_input()
count=0
if ('0' in x or '1' in x or '2'in x or '3' in x or '4' in x or '5' in x or '6' in x or '7' in x or '8' in x or '9' in x):   
    count=count
else:
    count+=1
    
    
check=0
for v in x:
        if ord(v)>=65 and ord(v)<=90:
            check=1
            break
if check==0:
    count+=1
check=0
for v in x:
        if ord(v)>=97 and ord(v)<=122:
            check=1
            break
if check==0:
    count+=1
 #"!@#$%^&*()-+"   
if ('!' in x or '@' in x or '#' in x or '$' in x or '%' in x or '^' in x or '&' in x or '*' in x or '()' in x or ')' in x or '-' in x or '+' in x):
    count=count
else:
    count+=1
    
if len(x)+count<6:
    count+=6-(len(x)+count)
print count