#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n;
    string a;
    scanf("%d",&n);
    cin>>a;

    int i;
    int d=1,l=1,u=1,s=1;
    int ans=0;
    int dg;
    if(n<6)
        dg = 6-n;
    else dg = 0;

    for(i=0; i<n; i++)
    {
        if(a[i]>='0'&&a[i]<='9')
            d=0;
        if(a[i]>='a'&&a[i]<='z')
            l=0;
        if(a[i]>='A'&&a[i]<='Z')
            u=0;

        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]=='+')
            s=0;

    }
    ans = d+l+u+s;
    if(!dg||ans>dg)
        cout<<ans<<endl;
    else
    {
        cout<<dg<<endl;
    }
}