#include <bits/stdc++.h>

using namespace std;


int main() {
    int n;
    cin >> n;
    string p;
    cin >> p;
    int a=1,b=1,c=1,d=1;
    for(int i=0;i<n;i++)
    {
        if(p[i]>='0'&&p[i]<='9')
            a=0;
        else if(p[i]>='a'&&p[i]<='z')
            b=0;
        else if(p[i]>='A'&&p[i]<='Z')
            c=0;
        else if(p[i]=='!'||p[i]=='@'||p[i]=='#'||p[i]=='$'||p[i]=='%'||p[i]=='^'||p[i]=='&'||p[i]=='*'||p[i]=='('||p[i]==')'||p[i]=='-'||p[i]=='+')
            d=0;
    }
    int t=a+b+c+d;
    if(t>6-n)
        cout<<t;
        else
            cout<<6-n;
    return 0;
}