#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 a=0,i=0;
    for(i=0;i<n;i++){
        if(password[i]<='9' && password[i] >= '0')break;
    }
    if(i==n)a++;
    for(i=0;i<n;i++){
        if(password[i]=='!' || password[i]=='@' || password[i]=='#' || password[i]=='$' || password[i]=='^' || password[i]=='&' || password[i]=='*' || password[i]=='(' || password[i]==')' || password[i]=='-' ||   password[i]=='+')break;
    }
    if(i==n)a++;
     for(i=0;i<n;i++){
        if(password[i]<='z' && password[i] >= 'a')break;
    }
    if(i==n)a++;
    for(i=0;i<n;i++){
        if(password[i]<='Z' && password[i] >= 'A')break;
    }
    if(i==n)a++;
    if(n<6){
        if(6-n<a)return a;
        return 6-n;
    }
    return a;
}

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;
}