#include <bits/stdc++.h>
using namespace std;
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define vv(type, c, m, n, i) vector<vector<type>> c(m, vector<type>(n, i))
#define rep(i,a,n) for(int i=(a), i##_len=(n); i<i##_len; ++i)
#define rrep(i,a,n) for(int i=(a), i##_len=(n); i>i##_len; --i)
#define len(x) ((int)(x).size())
#define mp make_pair
#define eb emplace_back
#define em emplace
#define fi first
#define se second
#define get(a, i) get<i>(a)
#define mt make_tuple
template<typename T> inline T min(vector<T>& v) {return *min_element(v.begin(), v.end());}
template<typename T> inline T max(vector<T>& v) {return *max_element(v.begin(), v.end());}
#define sum(a, b) accumulate(a, b)
#define chmax(a,b) if(a<b)a=b
#define chmin(a,b) if(a>b)a=b
#define printk(v) rep(i, 0, len(v) - 1) { cout << v[i] << " "; } cout << v.back() << endl;
template <class T> inline void print(T t){cout << t << "\n";}
template <class H, class... T> inline void print(H h, T... t){cout << h << " ";print(t...);}
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<long long> vll;
typedef vector<string> vs;
typedef vector<bool> vb;
typedef pair<int, int> pii;
bool solve(string s) {
	for (char c: s) {
		if (!isdigit(c))
			return false;
	}
	if (to_string(stoi(s)) != s || stoi(s) > 12345)
		return false;
	return true;
}
int main() {
	string a, b; cin >> a >> b;
	print(solve(a) + solve(b) == 2 ? "OK" : "NG");
	return 0;
}