#include <bits/stdc++.h>
using namespace std;

#ifdef DEBUG_
#include <compe/debug.hpp>
#else
#define dump(...)
#endif

#define FastIO cin.tie(nullptr), ios_base::sync_with_stdio(false);
#define rep(i, n) for (int i = 0; (int)i < n; ++i)
#define repa(i, a, n) for (int i = a; (int)i < n; ++i)
#define rrep(i, n) for (int i = n; (int)i >= 0; --i)
#define rrepa(i, a, n) for (int i = a; (int)i >= n; --i)
#define EACH(x, a) for (auto& x : a)
#define output(msg) cout << (msg) << '\n'
#define die(msg)         \
  do {                   \
    cout << msg << endl; \
    exit(0);             \
  } while (0)

template <class A> void read(vector<A>& v);
template <class A, size_t S> void read(array<A, S>& a);
template <class T> void read(T& x) {
  cin >> x;
}
void read(double& d) {
  string t;
  read(t);
  d = stod(t);
}
void read(long double& d) {
  string t;
  read(t);
  d = stold(t);
}
template <class H, class... T> void read(H& h, T&... t) {
  read(h);
  read(t...);
}
template <class A> void read(vector<A>& x) {
  EACH(a, x) read(a);
}
template <class A, size_t S> void read(array<A, S>& x) {
  EACH(a, x) read(a);
}
template <typename T> bool chmax(T& a, const T& b) {
  return ((a < b) ? (a = b, true) : (false));
}
template <typename T> bool chmin(T& a, const T& b) {
  return ((a > b) ? (a = b, true) : false);
}

using llint = long long int;

bool is_reading_zero(const string& s) {
  if (s.size() == 1) return false;

  int zero{(int)s.size()}, idx{};
  rep(i, (int)s.size()) if (s[i] == '0') {
    zero = i;
    break;
  }
  rep(i, (int)s.size()) if (s[i] != '0') {
    idx = i;
    break;
  }
  return zero < idx;
}

int main() {
  FastIO;

  string a, b;
  read(a, b);

  rep(i, (int)a.size()) {
    if (!('0' <= a[i] && a[i] <= '9')) die("NG");
  }

  rep(i, (int)b.size()) {
    if (!('0' <= b[i] && b[i] <= '9')) die("NG");
  }

  bool is_a_good{false}, is_b_good{false};
  repa(i, 0, 12345 + 1) {
    if (a == to_string(i)) {
      is_a_good = true;
    }
    if (b == to_string(i)) {
      is_b_good = true;
    }
  }

  if (is_a_good && is_b_good)
    output("OK");
  else
    output("NG");
}