#include<string>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n;
    string s;
    cin>>n;
    cin>>ws;
    getline(cin,s);
    int countl=0,countu=0,countn=0,counts=0,sum=0;
    for(int i=0;i<n;i++)
    {
        if(s[i]>=65&&s[i]<=90)
            countu++;
        if(s[i]>=97&&s[i]<=122)
            countl++;
        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]=='+')
            counts++;
        if(s[i]>=48&&s[i]<=57)
            countn++;
    }
    if(n>=6)
    {
        if(countl>0&&countu>0&&countn>0&&counts>0)
        {
            cout<<0<<endl;
        }
        else
        {
            if(countl==0)
                sum++;
            if(countu==0)
                sum++;
            if(counts==0)
                sum++;
            if(countn==0)
                sum++;
            cout<<sum<<endl;
        }
    }
    else
    {
        if(countl>0&&countu>0&&countn>0&&counts>0)
        {
            cout<<6-n<<endl;
        }
        else
        {    
            if(countl==0)
                sum++;
            if(countu==0)
                sum++;
            if(counts==0)
                sum++;
            if(countn==0)
                sum++;
            if(n+sum>=6)
                cout<<sum<<endl;
            else
                cout<<6-n<<endl;
        }   
    }
    return 0;
}