#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
int var1=0,var2=0,var3=0,var4=0;
    int i=0,j,ans=0,n;
    cin>>n;
    string s; cin>>s;
    while(i<n) {
        if(s[i]>='A' && s[i]<='Z') ++var1;
        else if(s[i]>='a' && s[i]<='z') ++var2;
        else if(s[i]>='0' && s[i]<='9') ++var3;
        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]=='+') ++var4;
        i++;
    }
    //cout<<var1<<' '<<var2<<' '<<var3<<' '<<var4<<endl;
    if(var1==0) ++ans;
    if(var2==0) ++ans;
    if(var3==0) ++ans;
    if(var4==0) ++ans;
    n+=ans;
    if(n<6) ans+=abs(6-n);
    cout<<ans;
}