import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Main {

    static BufferedReader in;
    static PrintWriter out;
    static StringTokenizer tok;

    void solve() throws IOException {
        String a = ns();
        String b = ns();

        boolean flg = false;
        for (int i = 0; i < a.length(); i++) {
            if ('0' <= a.charAt(i) && a.charAt(i) <= '9') {
                if (!flg && i < a.length() - 1 && a.charAt(i) == '0') {
                    out.println("NG");
                    return;
                }
                flg = true;
            } else {
                out.println("NG");
                return;
            }
        }
        int x = Integer.parseInt(a);
        if (x > 12345) {
            out.println("NG");
            return;
        }

        flg = false;
        for (int i = 0; i < b.length(); i++) {
            if ('0' <= b.charAt(i) && b.charAt(i) <= '9') {
                if (!flg && i < b.length() - 1 && b.charAt(i) == '0') {
                    out.println("NG");
                    return;
                }
                flg = true;
            } else {
                out.println("NG");
                return;
            }
        }
        int y = Integer.parseInt(b);
        if (y > 12345) {
            out.println("NG");
            return;
        }

        out.println("OK");
    }


    String ns() throws IOException {
        while (!tok.hasMoreTokens()) {
            tok = new StringTokenizer(in.readLine(), " ");
        }
        return tok.nextToken();
    }

    int ni() throws IOException {
        return Integer.parseInt(ns());
    }

    long nl() throws IOException {
        return Long.parseLong(ns());
    }

    double nd() throws IOException {
        return Double.parseDouble(ns());
    }

    String[] nsa(int n) throws IOException {
        String[] res = new String[n];
        for (int i = 0; i < n; i++) {
            res[i] = ns();
        }
        return res;
    }

    int[] nia(int n) throws IOException {
        int[] res = new int[n];
        for (int i = 0; i < n; i++) {
            res[i] = ni();
        }
        return res;
    }

    long[] nla(int n) throws IOException {
        long[] res = new long[n];
        for (int i = 0; i < n; i++) {
            res[i] = nl();
        }
        return res;
    }

    public static void main(String[] args) throws IOException {
        in = new BufferedReader(new InputStreamReader(System.in));
        out = new PrintWriter(System.out);
        tok = new StringTokenizer("");
        Main main = new Main();
        main.solve();
        out.close();
    }
}