#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) {
    int lw=0,uw=0,digit=0,cnt=0,sc=0;
    for(int i=0;i<n;i++)
    {
        if(password[i]>=65&&password[i]<=90)
            uw++;
        else if(password[i]>=97&&password[i]<=122)
            lw++;
        else 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]=='+')
            sc++;
        else if(password[i]>='0'&&password[i]<='9')
            digit++;
    }
    if(uw==0)
        cnt++;
    if(lw==0)
        cnt++;
    if(digit==0)
        cnt++;
    if(sc==0)
        cnt++;
        if((cnt+n)<6)
           cnt+=(6-(cnt+n));
    return cnt;
    // Return the minimum number of characters to make the password strong
}

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;
}