#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 flag1,flaga,flagA,flags,i,c=0;
    flag1=flaga=flagA=flags=0;
    char ch;
    for(int i=0;i<n;i++)
    {
        ch=password[i];
        if(flag1==0||flaga==0||flagA==0||flags==0)
        {
            if(flags==0)
            {
                if(ch=='!'||ch=='@'||ch=='#'||ch=='$'||ch=='%'||ch=='^'||ch=='&'||ch=='*'||ch=='('||ch==')'||ch=='-'||ch=='+')
                    flags=1;
            }
            if(flag1==0)
            {
                int k=ch-'0';
                if(k>=0&&k<=9)
                    flag1=1;
            }
            if(flaga==0)
            {
                if(ch>=97&&ch<=122)
                    flaga=1;
            }
            if(flagA==0)
            {
                if(ch>=65&&ch<=90)
                    flagA=1;
            }
        }
        else
            break;
    }
    if(flag1==0)
        c++;
    if(flaga==0)
        c++;
    if(flagA==0)
        c++;
    if(flags==0)
        c++;
    if(n+c>=6)
        return c;
    else if(n+c>=6)
        return c;
    else
         return c+(6-(n+c));
    // 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;
}