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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    char s;
    
    
    int cnt=0;
    int lc=0,uc=0,sc=0,nc=0;
    
    for(int i=0;i<n;i++){
        cin>>s;
        if(s>=65 && s<=90) uc++;
        else if(s>=97 && s<=122) lc++;
        else if(s>=35 && s<=38 || s>=40 && s<=43 || s=='-' || s=='^' || s=='!' || s=='@') sc++;
        else if(s>=48 && s<=57) nc++;
    }
    
    if(sc==0) cnt++;
    if(lc==0) cnt++;
    if(uc==0) cnt++;
    if(nc==0) cnt++;
    
    if(n+cnt < 6) cout<<6-n<<endl;
    else
     cout<<cnt<<endl;
    
    return 0;
}