#include <bits/stdc++.h>
#include <string.h>

using namespace std;

int minimumNumber(int n, char pass[101]) {
    
    int nr=0,i;
    int ok[4]={0};
    
    for (i=0; i<n; i++)
    {
        if(strchr("0123456789",pass[i])) ok[0]=1;
        else if(strchr("abcdefghijklmnopqrstuvwxyz",pass[i])) ok[1]=1;
        else if(strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZ",pass[i])) ok[2]=1;
        else if(strchr("!@#$%^&*()-+",pass[i])) ok[3]=1;
    }
                       
     for(i=0; i<4; i++)
    {
        if(!ok[i]) nr++;
    }
                       
    if(n+nr<6) nr+=6-(n+nr);
    
    
    return nr;
    
}

int main() {
    int n;
    cin >> n;
    char pass[101];
    cin>>pass;
    int answer = minimumNumber(n, pass);
    cout << answer << endl;
    return 0;
}