import java.util.Scanner;

public class main6u3 {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        
        if (sc.hasNextLine()) {
            String s = sc.nextLine();
            int n = sc.nextInt();
            if (n >= 0 && n < s.length()) {
                System.out.print(s.charAt(n));
            } else {
                System.out.print("error");
            }
        }
        sc.close();
    }
}