#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int minimumNumber(int n, char* password) {
    // Return the minimum number of characters to make the password strong
    int len = strlen(password);
    int i=0 , digits=0 , low=0 , up=0 , spl=0 , total=0 , ret=0;
   
        for(i=0;i<len;i++)
        {
            if(password[i]>='0' && password[i]<='9')
                digits++;
            if(password[i]>='a'&& password[i]<='z')
                low++;
            if(password[i]>='A'&& password[i]<='Z')
                up++;
            if(password[i]=='!'|| password[i]=='@' || password[i]=='#' || password[i]=='$' || password[i]== '%' || password[i]== '^' || password[i]=='&' || password[i]=='*' || password[i]=='(' || password[i]== ')' || password[i]== '-' || password[i]=='+')
                spl++;
        }
    
    
    
    
    if(digits==0)
       total++;
    if(low==0)
        total++;
    if(spl==0)
        total++;
    if(up==0)
        total++;
    
   
    if((len+total)<6)
    {
        ret = 6-len;
        return ret;

    }
    else 
        return total;
}

int main() {
    int n; 
    scanf("%i", &n);
    char* password = (char *)malloc(512000 * sizeof(char));
    scanf("%s", password);
    int answer = minimumNumber(n, password);
    printf("%d\n", answer);
    return 0;
}