#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <bits/stdc++.h>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n, i, j, lcnt=1, ucnt=1, ncnt=1, scnt=1;
    cin>>n;
    char a[n];
    for(i=0; i<n; i++)
    {
        cin>>a[i];
        if(a[i]>='0'&&a[i]<='9')
        {
            if(ncnt==1)
            ncnt--;
            else continue;
        }
        if(a[i]>='a'&&a[i]<='z')
        {
            if(lcnt==1)
            lcnt--;
            else continue;
        }
        if(a[i]>='A'&&a[i]<='Z')
        {
            if(ucnt==1)
            ucnt--;
            else continue;
        }
        if(a[i]=='!'||a[i]=='@'||a[i]=='#'||a[i]=='$'||a[i]=='%'||a[i]=='^'||a[i]=='&'||a[i]=='*'||a[i]=='('||a[i]==')'||a[i]=='-'||a[i]=='+')
        {
            if(scnt==1)
            scnt--;
            else continue;
        }
    }
    if((6-n)>(lcnt+ucnt+scnt+ncnt))
        cout<<6-n<<endl;
    else
        cout<<(lcnt+ucnt+scnt+ncnt);
    return 0;
}