#include<bits/stdc++.h> using namespace std; int main() { int x, y; while (cin >> x >> y) { if (x == 0 && y == 0) break; else { int flag = 0; for (int i = x; i <= y; i++) { int f = i * i + i + 41; for (int i = 2; i < f; i++) { if (f % i == 0) { flag++; cout << "Sorry" << endl; break; }

			}
	  }
		if (!flag)cout << "OK" << endl;
	}
}
return 0;

}