#include <bits/stdc++.h>

using namespace std;
bool isSpecial(char c)
{

    switch (c){
    case '!':
    case '@':
    case '#':
    case '$':
    case '%':
    case '^':
    case '&':
    case '*':
    case '(':
    case ')':
    case '-':
    case '+':
        return 1;
    default: return 0;
    }
}
int main()
{
    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
    string pw;
    int n , i , j;
    bool ok[4];
    memset(ok,false,sizeof(ok));

    scanf("%d",&n);
    for(i=0;i<n;i++){
        char c;
        cin>>c;
        pw[i]=c;
        if(isdigit(c)){ok[0]=true; }//cout<<0<<" "<<c<<endl;}
        if(islower(c)){ok[1]=true; }// cout<<1<<" "<<c<<endl;}
        if(isupper(c)){ok[2]=true; }//cout<<2<<" "<<c<<endl;}
        if(isSpecial(c)){ok[3]=true; }//cout<<3<<" "<<c<<endl;}
    }
    int s=0;
    for(i=0;i<4;i++)if(!ok[i])s++;
    if(n>=6)cout<<s<<endl;
    else {
        cout<<max(6-n,s)<<endl;
    }
    return 0;
}