/*
Author : sachinbisht939 || __B
*/


#include<bits/stdc++.h>
using namespace std;

#define unlock_ios ios_base::sync_with_stdio(0); cin.tie(0), cout.tie(0);
#define pb(x) push_back(x)
#define ff first
#define ss second
#define mp make_pair
typedef long long ll;
typedef pair <int,int> ii;
typedef pair <int, ii> iii;
typedef pair <char,int> ci;
typedef pair <int,char> ic;
typedef pair <string, int> si;

const int maxn = 1e5+10;
const int MOD = 1e9 + 7;


// Driver Code
int main()
{
	unlock_ios

	int n;
    cin >> n;
    string s;
    cin >> s;
    
    bool salp = 1, lalp = 1, sp = 1, num = 1;
    for(int i = 0; i < s.size(); i++)
    {
        if(s[i] >= 'a' && s[i] <= 'z')
            salp = 0;
        else if(s[i] >= 'A' && s[i] <= 'Z')
            lalp = 0;
        else if(s[i] >= '0' && s[i] <= '9')
            num = 0;
        else
            sp = 0;
    }
    int val = salp + lalp + sp + num;
    //cout << val << "\n";
    if(s.size() + val < 6)
        cout << 6 - s.size();
    else
        cout << val;
}