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


int main() {
    int n;
    cin>>n;
    string a,b="!@#$%^&*()-+";
    cin>>a;
    int d=0,up=0,lo=0,s=0,sp=0;
    for(int i=0;i<a.size();i++)
    {
        if(a[i]>='0'&&'9'>=a[i])
        {
            d++;
        }
        if(a[i]>='A'&&'Z'>=a[i])
        {
            up++;
        }
        if(a[i]>='a'&&'z'>=a[i])
        {
            lo++;
        }
        for(int j=0;j<b.size();j++)
            if(b[j]==a[i])
                sp++;
    }
    int tot=0;
    if(!up)
        tot++;
    if(!lo)
        tot++;
    if(!d)
        tot++;
    if(!sp)
        tot++;
    //cout<<tot<<"\n";
    if(tot+a.size()<6)
        tot=6-(a.size());
    cout<<tot<<"\n";
    return 0;
}