#include <bits/stdc++.h>

using namespace std;
int specialchar(char c)
{
    if(c=='!' || c=='@' || c=='#' || c=='$' ||c=='%' || c=='^' || c=='&' || c=='*' || c=='(' || c==')' || c=='-' || c=='+')
        return 1;
    return 0;
}
int minimumNumber(int n, string s) {
int i;
     int num=0,sp=0,lo=0,up=0;
    int add=0;
    for(i=0;s[i]!='\0';i++)
    {
        if(s[i]>='0' && s[i]<='9')
            num=1;
        else if(s[i]>='a' && s[i]<='z')
            lo=1;
        else if(s[i]>='A' && s[i]<='Z')
            up=1;
        else
            sp=1;
        
    }
    add=(1-num)+(1-lo)+(1-up)+(1-sp);
    if((add+n)<6)
    {
        add=add+6-(add+n);
    }
    return add;
}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}