#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n=0,upper=0,lower=0,digit=0,special=0,i=0;
    char a[105];
        cin>>n;
    cin>>a;
    for(i=0;i<n;i++)
    {
        if(isdigit(a[i]))
            digit++;
        else
            if(islower(a[i]))
                lower++;
        else
            if(isupper(a[i]))
                upper++;
        else
            if((a[i]=='!')||(a[i]=='@')||(a[i]=='#')||(a[i]=='$')||(a[i]=='%')||(a[i]=='^')||(a[i]=='&')||(a[i]=='*')||(a[i]=='(')||(a[i]==')')||(a[i]=='-')||(a[i]=='+'))
                special++;
    }
    if(digit==0)
        n++;
    if(lower==0)
        n++;
    if(upper==0)
        n++;
    if(special==0)
        n++;
    if(n<6)
        n=n+6-n;
    cout<<n-strlen(a);
}