#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 digit = 1;
    int lcase = 1;
    int ucase = 1;
    int sgn = 1;
    int len = strlen(password);
    char charact[] = "!@#$%^&*()-+";
    
    int rlt;
    
    for(int i = 0; i < len; i++){
        
        int j;
        
        if(password[i] <= '9' && password[i] >= '0') digit = 0;
        else if(password[i] >= 'a' && password[i] <='z') lcase = 0;
        else if(password[i] >= 'A' && password[i] <='Z') ucase = 0;        
        else{
            if(sgn == 1){
                for(j = 0; j < 12; j++){
                    if(password[i] == charact[j]) break;
                }
                if(j < 12) sgn = 0;            
            }            
        }
        
        rlt = digit + lcase + ucase + sgn;        
        if(rlt == 0) break;
    }
    if(rlt + len < 6) rlt = 6 - len;
    return rlt;
}

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;
}