#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
    char s[n];
    cin>>s;
    int i=0;
    int cu=0, cl=0, cn=0, cc=0;
    while(s[i]!='\0')
    {
        if(s[i]>='a' && s[i]<='z')
            cl++;
        if(s[i]>='A' && s[i]<='Z')
            cu++;
        if(s[i]>='0' && s[i]<='9')
            cn++;
        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]=='+') 
            cc++;
        i++;
    }
    //cout<<cl<<" "<<cu<<" "<<cn<<" "<<cc<<endl;
    int count=0;
    if(cl==0)
    {
        count++;
        n++;
    }
    if(cu==0)
    {
        count++;
        n++;
    }
    if(cn==0)
    {
        count++;
        n++;
    }
    if(cc==0)
    {
        count++;
        n++;
    }
    while(n<6)
    {
        count++;
        n++;
    }
    cout<<count;
    return 0;
}