#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n,cnt=0;
    cin>>n;
    string s;
    cin>>s;
    bool num_chk=false;
    bool l_c = false;
    bool u_c = false;
    bool s_c = false;
    for(int i=0;s[i];i++)
    {    
        if(s[i]>='0' && s[i]<='9' && num_chk == false)
        {    cnt++; num_chk = true; }
        else if(s[i]>='a' && s[i]<='z' && l_c == false)
        {   cnt++;  l_c = true;   }
        else if(s[i]>='A' && s[i]<='Z' && u_c == false)
        {   cnt++;  u_c = true;   }
        else if(s_c == false  && (s[i]=='!' || s[i]=='@' || s[i]=='#' ||s[i]=='$' || s[i]=='%' || s[i]=='^' || s[i]=='&' ||s[i]=='*' ||s[i]=='(' || s[i]==')' || s[i]=='-' ||s[i]=='+'))
        {   cnt++;  s_c = true;   }
        else if(cnt==4)
            break;
    }
    if((6-n)>4-cnt)
        cout<<6-n<<"\n";
    else
        cout<<4-cnt;
    return 0;
}