# include # include # include # include # include # include # include # include # include # include # include # include # include # include # include # include # include # include # include # include using namespace std; using LL = long long; using ULL = unsigned long long; typedef pair P; constexpr int INF = 2147483647; constexpr int HINF = INF / 2; constexpr double DINF = 100000000000000000.0; constexpr long long LINF = 9223372036854775807; constexpr long long HLINF = 4500000000000000000; const double PI = acos(-1); int dx[4] = { 0,1,0,-1 }, dy[4] = { 1,0,-1,0 }; # define ALL(x) (x).begin(),(x).end() # define UNIQ(c) (c).erase(unique(ALL((c))),(c).end()) # define mp make_pair # define eb emplace_back # define FOR(i,a,b) for(int i=(a);i<(b);i++) # define RFOR(i,a,b) for(int i=(a);i>=(b);i--) # define REP(i,n) FOR(i,0,n) # define INIT std::ios::sync_with_stdio(false);std::cin.tie(0) string a, b; bool isok = true; int main() { cin >> a >> b; REP(i, a.size())if (!('0' <= a[i] && a[i] <= '9'))isok = false; REP(i, b.size())if (!('0' <= b[i] && b[i] <= '9'))isok = false; if (!isok) { cout << "NG" << endl; return 0; } int aa = stoi(a); int bb = stoi(b); if (aa > 12345 || bb > 12345)isok = false; if (aa < 10000 || bb < 10000)isok = false; if (!isok) { cout << "NG" << endl; } else { cout << "OK" << endl; } }