#!/bin/python3

import sys
num = "0123456789"
l = "abcdefghijklmnopqrstuvwxyz"
u= "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
s= "!@#$%^&*()-+"
def minimumNumber(n,p):
    n_=0
    l_=0
    u_=0
    s_=0
    cc=0
    for i in num:
        if i in p:
            n_=0
            cc=0
            break
        else:
            cc+=1
        if cc==10:
            n_=1
    cc=0       
    for i in l:
        if i in p:
            l_=0
            cc=0
            break
        else:
            cc+=1
          
        if cc==26:
            l_=1
    cc=0
    for i in u:  
        if i in p:
            u_=0
            cc=0
        else:
            cc+=1
        if cc==26:
            u_=1
    cc=0
    for i in s:  
        if i in p:
            s_=0
            break
        else:
            cc+=1
        if cc==12:
            s_=1
            
    c=n_+l_+u_+s_
    #print(c)
    if n>=6 and c==0:
        return 0
    elif n>=6:
        return c
    else:
        k=6-n
        #print(k)
        if n+c>=6:
            return c
        else:
            return 6-n 
            
    
        
       
    
    # Return the minimum number of characters to make the password strong

if __name__ == "__main__":
    n = int(input().strip())
    password = input().strip()
    answer = minimumNumber(n, password)
    print(answer)