#include<bits/stdc++.h>
#include<iostream>
using namespace std;
#define pb push_back
#define mp make_pair
#define s second
#define scan(x) scanf("%lld",&x)
#define print(x) printf("%lld",x)
#define rep(i,from,to) for(int i=from;i<=to;i++)
#define repd(i,from,to) for(int i=from;i>=to;i--)
#define MAX 10000
#define mod 1000000007
#define infi 10000000000
#define opt std::ios_base::sync_with_stdio(false)
typedef long long int ll;
ll powm(ll base,ll exp) {ll ans=1;while(exp){if(exp&1) ans=(ans*base)%mod;exp>>=1,base=(base*base)%mod;}return ans;} 

int main()
{
   opt;
   int n;
   cin>>n;
        string s;
        cin>>s;
        int x=n,count=0,a=0,b=0,c=0,d=0;
        for(int i=0;i<x;i++)
        {
            if(s[i]-'0'>=0 && s[i]-'0'<=9)
            {
                a=1;
            }
            else if(s[i]>='A' && s[i]<='Z')b=1;
            else if(s[i]>='a' && s[i]<='z')c=1;
            else if(s[i]=='!' || s[i]=='@' || s[i]=='#' || s[i]=='$' || s[i]=='%' || s[i]=='^' || s[i]=='&' || s[i]=='*' || s[i]=='(' || s[i]==')' || s[i]=='-' || s[i]=='+')
            {
                d=1;
            }
        }
        count=a+b+c+d;
        //cout<<a<<b<<c<<d<<endl;
        int r=0;
        if(a==0)r+=1;
        if(b==0)r+=1;
        if(c==0)r+=1;
        if(d==0)r+=1;
        if(r+x>=6)cout<<r<<endl;
        else cout<<6-x<<endl;
}