#include <bits/stdc++.h>

using namespace std;

int n,verif[7];
char a[102];

inline bool Verificare_CaracterS(char x)
{
    return x=='!' || x=='@' || x=='#' || x=='$' || x=='%' || x=='^' || x=='&' || x=='*' || x=='(' || x==')' || x=='-' || x=='+';
}

int main()
{
    int i,sol;
    cin>>n;
    cin>>a;

    for(i=0;a[i];i++)
        if('a'<=a[i] && a[i]<='z')verif[1]=1;
        else if('A'<=a[i] && a[i]<='Z')verif[2]=1;
        else if('0'<=a[i] && a[i]<='9')verif[3]=1;
        else if(Verificare_CaracterS(a[i]))verif[4]=1;

    sol=0;
    for(i=1;i<=4;i++)
        if(verif[i]==0)sol++;

    if(sol+n<6)sol+=6-sol-n;

    cout<<sol;
    return 0;
}