#include<bits/stdc++.h>
#define li long long int
using namespace std;

int main()
{
li n;
cin>>n;
string s;
cin>>s;




int ctr=0,ctr1=0,ctr2=0, ctr3=0;

for(int i=0;i<n;i++){
if(((int)(s[i])-48)>= 0 && ((int)(s[i])-48) <=9  )
    ctr=1;
    else if((s[i])>= 97 && (s[i]) <=122  )
    ctr1=1;
    else if((s[i])>= 65 && (s[i]) <=90  )
    ctr2=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])=='+' )
    ctr3=1;

//    cout<<ctr<<endl;
//    cout<<ctr1<<endl;
//    cout<<ctr2<<endl;
//    cout<<ctr3<<endl;
    //cout<<"this"<<endl;

}
if(n>=6 && ctr1==1 && ctr2==1 && ctr3==1 && ctr==1 )
    cout<<"0\n";
else{
        //cout<<"here\n";
    int y=0;
        if(ctr==0)
            y+=1;
        if(ctr1==0)
            y+=1;
             if(ctr2==0)
            y+=1;
             if(ctr3==0)
            y+=1;
//cout<<"y ="<<y<<endl;

            n=n+y;
           // cout<<"nAa233333 ="<<n<<endl;
           if(n<6){
              cout<<y+(6-n)<<endl;
           }
           else
            cout<<y<<endl;


}

return 0;
}