import sys
def minimumNumber(n, password):
    c=0
    if(len(password)>=6):
        if(any(x.isdigit() for x in password)):
            if(any(x.islower() for x in password)):
                if(any(x.isupper() for x in password)):
                    if(any(33<=ord(x)<=47 or ord(x)==94 for x in password)):
                        print("0")
                    else:
                        c+=1     
                else:
                       c+=1
            else:
                       c+=1
        else:
                       c+=1
    else:
        if(any(x.isdigit() for x in password)):
            if(any(x.islower() for x in password)):
                if(any(x.isupper() for x in password)):
                    if(any(33<=ord(x)<=47 or ord(x)==94 for x in password)):
                        c=0
                    else:
                        c+=1     
                else:
                       c+=1
            else:
                       c+=1
        else:
                       c+=1
        
        
    if(n+c<6):
                       c=c+6-n+c
    return c      
                       
                       
                       
            
            
        

    n = int(input().strip())
    password = input().strip()
    print("k")
    answer = minimumNumber(n, password)
    print("k")