#include <bits/stdc++.h>

#define scanI(n) scanf("%d", &n)
#define scanL(n) scanf("%ld", &n)
#define scanLL(n) scan("%lld", &n)
#define scanII(a, b) scanf("%d %d", &a, &b)
#define scanIII(a, b, c) scanf("%d %d %d", &a, &b, &c);
#define printI(n) printf("%d", n)
#define printII(a,b) printf("%d %d", a, b)
#define PRINT(list) for(auto i : list) printf("%d ", i); printf("\n");
#define PRINTARR(ar_, n_) for(int i_=0; i_<n_; i_++){printf("%d ", ar_[i_]);} printf("\n");
#define DPRINT(dlist) for(auto list : dlist) { PRsINT(list); printf("\n"); }
#define INIT(ar, n, val) for(int _i=0; _i<n; _i++) ar[_i] = val;
#define ALL(x) x.begin(), x.end()
#define VI vector<int>
#define LL long long
#define MOD 1000000007
#define PI 3.142857


using namespace std;

void test(){
} 


int main(){
    
    int n;
    scanI(n);
    string s;
    cin >> s;
    
    map<int, int> mem[126];
    
    int cnt = 0;
    bool lower=false, upper=false, digit=false, special=false;
    
    for(auto c : s){
        if(c >= 65 && c <= 90)
            upper = true;
        else if(c >= 97 && c <= 122)
            lower = true;
        else if(c >= 48 && c <= 57)
            digit = true;
        else if((c >= 33 && c <= 45) || c == 64)
            special = true;
    }
    
    if(!lower) cnt++;
    if(!upper) cnt ++;
    if(!digit) cnt++;
    if(!special) cnt++;
    //printf("%d %d %s\n", cnt, s.size(), s.c_str());
    if((s.size() + cnt) < 6)
        cnt += 6 - (s.size() + cnt);
    printI(cnt);
    return 0;
}