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


int main() {
    int n;
    cin>>n;
    string s;
    int ans=0;
    cin>>s;
    int d=0,l=0,u=0,sp=0;
    int len=s.size();
    for(int i=0;i<s.size();i++)
    {
        if(s[i]>='a'&&s[i]<='z')
            l++;
        else if(s[i]>='A'&&s[i]<='Z')
            u++;
        else if(s[i]>='0'&&s[i]<='9')
            d++;
        else 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]=='+')
            sp++;
    }
    if(d==0)
    ans++;
    if(u==0)
        ans++;
    if(sp==0)
        ans++;
    if(l==0)
        ans++;
    if(len+ans<6)
        ans=ans+(6-(len+ans));
    cout<<ans;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}