#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <cstring>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int checkLength, checkDigit, checkLowerCase, checkUpperCase, checkSpecial, i, len, ans, newLen, size;
    cin >> size;
    char password[size+1];
    checkLength = checkDigit = checkLowerCase = checkUpperCase = checkSpecial = ans = 0;
    cin >> password;
    len = strlen(password);
    if(len >= 6)
        checkLength = 1;
    for(i = 0; password[i] != '\0'; i++){
        if('0' <= password[i] && password[i] <= '9')
            checkDigit = 1;
        else if('a' <= password[i] && password[i] <= 'z')
            checkLowerCase = 1;
        else if('A' <= password[i] && password[i] <= 'Z')
            checkUpperCase = 1;
        else if(password[i] == '!' || password[i] == '@' || password[i] == '#' || password[i] == '$' || password[i] == '%' || password[i] == '^' || password[i] == '&' || password[i] == '*' || password[i] == '(' || password[i] == ')' || password[i] == '-' || password[i] == '+')
            checkSpecial = 1;
    }
    
    if(!checkDigit)
        ans++;
    if(!checkLowerCase)
        ans++;
    if(!checkUpperCase)
        ans++;
    if(!checkSpecial)
        ans++;
    
    newLen = len+ans;
    if(newLen < 6){
        ans += 6-newLen;
    }
    
    cout << ans << "\n";
    
    return 0;
}