#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  numbers = "0123456789";
 char lower_case = "abcdefghijklmnopqrstuvwxyz";
char upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 char special_characters = "!@#$%^&*()-+";
if(char* password<n){return n-1;}
    else if ((char* password!=numbers) &&(char* password==lower_case)&&(char* password==upper_case)&&(char* password==special_characters)){
        return 1;   }
        else if((char* password!=numbers) &&(char* password!=lower_case)&&(char* password==upper_case)&&(char* password==special_characters)){
            return 2;   }
            else if((char* password!=numbers) &&(char* password!=lower_case)&&(char* password!=upper_case)&&(char* password==special_characters)){
                return 3;  }
            
        
    


    
    
    
}

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;
}