L = [int(input()) for i in range(4)] if L[0] == L[1] == L[2] == L[3]: print("Fish At Constant Depth") elif L[0] < L[1] < L[2] < L[3]: print("Fish Rising") elif L[0] > L[1] > L[2] > L[3]: print("Fish Diving") else: print("No Fish")