import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNext()) {
            String strs = scanner.nextLine();
            String[] strings = strs.split(" ");

            int x = Integer.parseInt(strings[0]);
            int y = Integer.parseInt(strings[1]);

            boolean bool = true;
            if (y == 0 && x == 0) {

            } else {
                int[] num = new int[y - x + 1];
                int j = 0;            
                for (int i = x; i <= y; i++) {
                    num[j] = (int) (Math.pow(i, 2) + i + 41);
                    j++;
                }
                for (int i = 0; i < num.length; i++) {
                    int n = 2;
                    while (num[i] % n == 0 && n < num[i]) {
                        bool = false;
                        n++;
                    }
                }
                if (bool) {
                    System.out.println("OK");
                } else {
                    System.out.println("Sorry");
                }
            }

        }
    }
}