You need to answer a given question containing a blank (_). Your answer must be one of the two objects mentioned in the question, for example "trophy" and "suitcase". Your answer must not contain a word that is not present in the question. Please don't use articles (e.g., the, a) before the answer.

Ex Input:
The water got murky after the stone was dropped into it but the _ was before dirty.

Ex Output:
stone


Ex Input:
The mother attended the baby's baptism while the father stayed home, since _ 's presence was optional for the ritual.

Ex Output:
father


Ex Input:
She wanted to display the ad on the billboard, but the _ was too big.

Ex Output:

ad