#include<bits/stdc++.h>
using namespace std;
int main()
{
    int len;
    string s;
    cin>>len;
    cin>>s;
    string sp = "!@#$%^&*()-+";
    int dig=0, up=0, lo=0,spe=0;
    int add = 0;
    for(int i=0; i<len; i++){
        if(isupper(s[i])) up++;
        if(islower(s[i]))lo++;
        if(isdigit(s[i]))dig++;
        if(s[i]=='!' ||s[i]=='@' ||s[i]=='#' ||s[i]=='$' ||s[i]=='%' ||s[i]=='^' ||s[i]=='&' ||s[i]=='*' ||s[i]=='(' ||s[i]==')' ||s[i]=='-' ||s[i]=='+' ) spe++;
    }
    if(dig==0) add++;
    if(up==0) add++;
    if(lo==0) add++;
    if(spe==0) add++;
    if(len + add<6){
        add = 6-len;
    }
    cout<<add<<endl;
}