#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define rep3(i, l, n) for (int i = l; i < n; ++i)
#define chmax(a, b) a = (a >= b ? a : b)
#define chmin(a, b) a = (a <= b ? a : b)
#define out(a) cout << a << endl
#define outa(a, n) rep(_, n) cout << a[_] << " "; cout << endl
#define SZ(v) (int)v.size()
#define inf (int)(1e9+7)
#define abs(x) (x >= 0 ? x : -(x))
#define ceil(a, b) a / b + !!(a % b)

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    string a, b;
    cin >> a >> b;
    bool flg = 0;
    if (SZ(a) != 1 && a[0] == '0') flg = 1;
    if (SZ(b) != 1 && b[0] == '0') flg = 1;
    rep(i, SZ(a)) if (a[i] < '0' || a[i] > '9') flg = 1;
    rep(i, SZ(b)) if (b[i] < '0' || b[i] > '9') flg = 1;
    if (flg) { out("NG"); return 0; }
    // 数でない文字をstoiしてはいけない
    if (stoi(a) < 0 || stoi(a) > 12345) flg = 1;
    if (stoi(b) < 0 || stoi(b) > 12345) flg = 1;
    out((flg == 0 ? "OK" : "NG"));
}