#include using namespace std; typedef long long ll; #define F first #define S second #define pii pair #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; if (a < "0" || a > "12345") flg = 1; if (b < "0" || b > "12345") flg = 1; out((flg == 0 ? "OK" : "NG")); }