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

char s[105];
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n;
    scanf("%d ", &n);
    for(int i = 0; i < n; ++i) scanf("%c", s + i);
    
    int len, dig, up, lo, sp;
    len = dig = up = lo = sp = 0;
    for(int i = 0; i < n; ++i) {
        char c = s[i];
        len++;
        if(c >= '0' && c <= '9') dig++;
        else if(c >= 'A' && c <= 'Z') up++;
        else if(c >= 'a' && c <= 'z') lo++;
        else sp++;
    }
    
    int cnt = 0;
    if(dig == 0) {
        cnt++;
        len++;
    }
    if(up == 0) {
        cnt++;
        len++;
    }
    if(lo == 0) {
        cnt++;
        len++;
    }
    if(sp == 0) {
        cnt++;
        len++;
    }
    
    if(len < 6) cnt += 6 - len;
    
    printf("%d", cnt);
    
    
    return 0;
}