#include <bits/stdc++.h>
using namespace std;
#define mod 1000000007
#define FOR(i,n) for(int i=0;i<n;i++)

// sometimes I believe compiler ignores all my comments


int main() 
{
    ios_base::sync_with_stdio(false); 
    cin.tie(NULL);
    cout.tie(NULL);
    int t;
    char c;
    cin>>t;
    int n = 0;
    bool cl = 0, ss = 0, nn = 0, cu = 0;
    for(int i = 0; i < t; i++)
    {
		cin>>c;	
		if(c >= 'A' && c <='Z')
			cu = 1;
		else if(c >= 'a' && c <= 'z')
			cl = 1;
		else if(c >= '0' && c <= '9')
			nn = 1;
		else if(c=='!'||c=='&'||c=='@'||c=='#'||c=='$'||c=='%'||c=='*'||c=='('||c==')'||c=='-'||c=='+'||c=='^')
			ss = 1;
	}
    if(!cu)
            n++;
    if(!cl)
            n++;
    if(!nn)
            n++;
    if(!ss)
            n++;
    if((t + n) < 6)
        cout << (6 - t);
    else
        cout << n;
	return 0;
}