#include <iostream>

using namespace std;

int main()
{
    int n;
    cin>>n;
    string temp;
    cin>>temp;
    int digit=0;
    int specialcharacters=0;
    int lowercase=0;
    int uppercase=0;
    int x=0;
    for(x=0;temp[x]!='\0';x++)
    {
        if(temp[x]>=97 && temp[x]<=122)
            lowercase+=1;
        else if(temp[x]>=65 && temp[x]<=90)
            uppercase+=1;
        else if(temp[x]>=48 && temp[x]<=57)
            digit+=1;
        else
            specialcharacters+=1;
    }
    int counter=0;
    if(digit==0)
        counter+=1;
    if(specialcharacters==0)
        counter+=1;
    if(lowercase==0)
        counter+=1;
    if(uppercase==0)
        counter+=1;
    if(n+counter>=6)
        cout<<counter;
    else
        cout<<counter+6-(n+counter);
    return 0;
}