#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n,c=0,d=0,e=0,f=0,i;
    cin>>n;
    string s;
    cin>>s;
    for(i=0;i<s.size();i++)
    {
        if(isupper(s[i]))
            c=1;
        if(isdigit(s[i]))
            d=1;
        if(islower(s[i]))
            e=1;
        if(s[i]=='!'||s[i]=='@'||s[i]=='#'||s[i]=='$'||s[i]=='%'||s[i]=='^'||s[i]=='&'||s[i]=='*'||s[i]=='('||s[i]==')'||s[i]=='-'||s[i]=='+')
            f=1;
    }
    int ans=0;
    if(c==0)
        ans++;
    if(d==0)
        ans++;
    if(e==0)
        ans++;
    if(f==0)
        ans++;
    if(s.size()+ans>=6)
    {
        cout<<ans<<endl;
    }
    else
    {
        cout<<6-s.size()<<endl;
    }
}