#include<bits/stdc++.h>
using namespace std;
#define mod 1000000007
#define MAX 1000000000000000
#define all(v) v.begin(),v.end()
#define rep(i,a,b) for(i=(ll)a;i<(ll)b;i++)
#define revrep(i,a,b) for(i=(ll)a;i>=(ll)b;i--)
#define ii pair<ll,pair<ll,ll> >
#define MP make_pair
#define pb push_back
#define f first
#define se second
#define ll long long int
#define vi vector<ll>
ll modexp(ll a,ll b){ ll res = 1; while(b > 0){  if(b & 1) res = (res * a);  a = (a * a);  b/=2;  }  return res; }
#define rs resize
long long readLI(){  register char c;  for(c = getchar(); !(c>='0' && c<='9'); c = getchar());  register long long a=c-'0';
    for(c = getchar(); c>='0' && c<='9'; c = getchar())
        a = (a<<3)+(a<<1)+c-'0';
    return a;
}
const ll N = 100009;
ll n,i,r;
string a;
bool no,len,up,low,s;
int main()
{
    std::ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin>>n>>a;
    rep(i,0,n){
        if(a[i] >= 'A' and a[i] <= 'Z') up = true;
        if(a[i] >= 'a' and a[i] <= 'z') low = true;
        if(a[i] >= '0' and a[i] <= '9') no = true;
        if(a[i] == '!' or a[i] == '@' or a[i] == '#' or a[i] == '$' or a[i] == '%' or a[i] == '^' or a[i] == '&' or a[i] == '*' or a[i] == '(' or a[i] == ')' or a[i] == '-' or a[i] == '+')
            s = true;
    }
    if(!up) r++;
    if(!low) r++;
    if(!no) r++;
    if(!s) r++;
    if(r + n < 6) r = r + (6 - r - n);
    cout<<r;
    return 0;
}