#include #define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++) #define REP(i,n) FOR(i,0,n) #define MOD 1000000007 #define int long long using namespace std; typedef long long ll; const int INF = 1e9; signed main() { string AB[2]; cin >> AB[0] >> AB[1]; REP(i,2) { REP(j,AB[i].length()) { if (AB[i].length() >= 2 && j == 0 && AB[i][j] == '0') { cout << "NG" << endl; return 0; } if ('0' <= AB[i][j] && AB[i][j] <= '9') continue; else { cout << "NG" << endl; return 0; } } } int A = stoi(AB[0]); int B = stoi(AB[1]); if (A > 12345 || B > 12345) { cout << "NG" << endl; return 0; } cout << "OK" << endl; }