#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int check(char* array, int n){
    char SpChar[12] = {'!','@','#','$','%','^','&','*','(',')','-','+'};
    for(int i=0; i<n; i++){
        for(int j=0;j<12;j++){
            if(array[i] == SpChar[j]){
                return 1;
            }
        }
    }
    return 0;
}

int minimumNumber(int n, char* password) {
    int Upflag = 0, Loflag = 0, Lenflag = 0, Special = 0, Numflag = 0,count =0,length = n;
    for(int i=0; i<n; i++){
        if(password[i] >= 'A' && password[i] <= 'Z'){
            Upflag = 1;
        }
        if(password[i] >= 'a' && password[i] <= 'z'){
            Loflag = 1;
        }
        if(n >= 6){
            Lenflag = 1;
        }
        if(password[i] >= '0' && password[i] <= '9'){
            Numflag = 1;
        }
        if(check(password,n)){
            Special = 1;
        }
    }
    if(Upflag && Loflag && Lenflag && Numflag && Special){
        return 0;
    }
    else{
        if(!Upflag){
            count++;
            length++;
        }
        if(!Loflag){
            count++;
            length++;
        }
        if(!Numflag){
            count++;
            length++;
        }
        if(!Special){
            count++;
            length++;
        }
        if(length < 6){
            count += 6 - length;
        }
        
    }
    return count;
}

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;
}