In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.

Input: Consider Input: The Doctor: I 'm sorry to tell you that Romana can look after herself . We 're Time Lords . Not like those innocents on Atrios , you know . Time Lords , sent by the Guardian to recover the Key to Time .
The Shadow: I know who you are , Doctor , I have always known . I have been waiting for you . I too serve a Guardian , a Guardian equal and opposite in power to the _ one _ you serve . The Black Guardian - he who walks in darkness . And you are in the valley of the Shadow !

Output: Guardian

Input: Consider Input: Sub-Commander T'Pol: It 's a thermo - kinetic analysis of the moons . Each of them undergoes extreme temperature variations during their orbits .
Captain Jonathan Archer: Go on .
Sub-Commander T'Pol: At night , it can drop to five or even ten degrees below _ zero _ .
Captain Jonathan Archer: That does n't sound so bad .
Sub-Commander T'Pol: During the day , the temperature can rise to as high as 170 degrees .
Captain Jonathan Archer: We better hope that Trip landed on the night side .
Sub-Commander T'Pol: And that we find him before the sun rises .

Output: degrees

Input: Consider Input: Elaine Frye Cavanaugh: I tried to instill discipline in June . Do well in school , practice your piano . And Roger would come right along behind me and spoil her with candy and sleepovers . That 's why I divorced him .
Detective Elliot Stabler: Yeah , well , it 's a tough world out there , you ca n't screw around .
Elaine Frye Cavanaugh: Clearly you have children .
Detective Elliot Stabler: I 've got _ five _ .
Elaine Frye Cavanaugh: Then you know perfection is n't easily attained .
Output: children