#include using namespace std; #ifdef DEBUG_ #include #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 void read(vector& v); template void read(array& a); template 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 void read(H& h, T&... t) { read(h); read(t...); } template void read(vector& x) { EACH(a, x) read(a); } template void read(array& x) { EACH(a, x) read(a); } template bool chmax(T& a, const T& b) { return ((a < b) ? (a = b, true) : (false)); } template 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"); }