#include <bits/stdc++.h>

using namespace std;

/*int minimumNumber(int n, string password) {
    // Return the minimum number of characters to make the password strong
        
}*/

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    //int answer = minimumNumber(n, password);
    int answer=0,a=0,b=0,c=0,d=0,g=0;
    for(int a0=0;a0<=n-1;a0++){
        if(password[a0]=='0'||password[a0]=='1'||password[a0]=='2'||password[a0]=='3'||password[a0]=='4'||password[a0]=='5'||password[a0]=='6'||password[a0]=='7'||password[a0]=='8'||password[a0]=='9')
            a=a+1;
        if(password[a0]=='A'||password[a0]=='B'||password[a0]=='C'||password[a0]=='D'||password[a0]=='E'||password[a0]=='F'||password[a0]=='G'||password[a0]=='H'||password[a0]=='I'||password[a0]=='J'||password[a0]=='K'||password[a0]=='L'||password[a0]=='M'||password[a0]=='N'||password[a0]=='O'||password[a0]=='P'||password[a0]=='Q'||password[a0]=='R'||password[a0]=='S'||password[a0]=='T'||password[a0]=='U'||password[a0]=='V'||password[a0]=='W'||password[a0]=='X'||password[a0]=='Y'||password[a0]=='Z')
            b=b+1;
        if(password[a0]=='a'||password[a0]=='b'||password[a0]=='c'||password[a0]=='d'||password[a0]=='e'||password[a0]=='f'||password[a0]=='g'||password[a0]=='h'||password[a0]=='i'||password[a0]=='j'||password[a0]=='k'||password[a0]=='l'||password[a0]=='m'||password[a0]=='n'||password[a0]=='o'||password[a0]=='p'||password[a0]=='q'||password[a0]=='r'||password[a0]=='s'||password[a0]=='t'||password[a0]=='u'||password[a0]=='v'||password[a0]=='w'||password[a0]=='x'||password[a0]=='y'||password[a0]=='z')
            d=d+1;
        if(password[a0]=='!'||password[a0]=='@'||password[a0]=='#'||password[a0]=='$'||password[a0]=='%'||password[a0]=='^'||password[a0]=='&'||password[a0]=='*'||password[a0]=='('||password[a0]==')'||password[a0]=='-'||password[a0]=='+')
            c=c+1;
        if(a!=0&&b!=0&&c!=0&&d!=0){
            g=1;
            break;
        }
        
    } 
    if(g==0){
        
    
    if(a==0){
        answer=answer+1;
        n=n+1;
    }
    if(b==0){
        answer=answer+1;
        n=n+1;
    }
    if(c==0){
        answer=answer+1;
        n=n+1;
    }
    if(d==0){
        answer=answer+1;
        n=n+1;
    }
    }
    if(n<6){
        answer=answer+(6-n);
    }
    cout << answer << endl;
    
    return 0;
}