Definition: 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: Mio Natsume:  So the President ... is a bunny ?
Rainbow Line President: I am not a bunny , I 'm the President .
Conductor: That 's right . He 's not a bunny . He 's a rabbit .
Rainbow Line President: Not that either . I 'm the President . There 's a way to take back the Terminal . We will use the Hyper Ressha Terminal 's new power . It 's a power that only works when all 13 TOQ trains and Support Ressha are together . We 'll be able to cast off the darkness and take back the Terminal .
Right Suzuki: Then ... Wait a moment !
Hikari Nonomura: You said 13 trains ... are n't we missing _ one _ ?
Mio Natsume: Really ? Um ...
Akira Nijino: You mean Drill Ressha , do n't you ?
Hikari Nonomura: Yeah .
Mio Natsume: Schwarz took it ...
Conductor: But that was originally a Shadow train .
Rainbow Line President: But it has great power . Plus I like drills !
Ticket: Do n't make your decisions based on your biases !
Rainbow Line President: At any rate , it wo n't activate till all 13 are together . It 's do or die .
Haru 'Tokatti' Tokashiki: That sounds amazing ... but also amazingly fussy .
Rainbow Line President: At this rate , the Terminal will sink into a Shadow Town . If that happens , the Rainbow Line 's loss will be assured . All stations would fall to the Shadow .

trains