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: Kouichi Sakakibara:  Extra One ?
Mei Misaki: Twenty five years ago , shortly after the start of the new management , they realized that a desk was missing in the classroom , even though they had prepared enough seats for all students .
Kouichi Sakakibara: Could not they just check the lists ?
Mei Misaki: They did , but it was useless . The list of students had been altered to be inconsistent . They only lacked a desk .
Kouichi Sakakibara: Did someone rewrote the lists ?
Mei Misaki: I used the word " altered " figuratively . They say that memories of all had been changed .
Kouichi Sakakibara: Uh ?
Mei Misaki: That sounds impossible , right ? But I guess that 's true . They said that this phenomenon could happen .
Kouichi Sakakibara: Phenomenon ?
Mei Misaki: At first , everyone thought it was just a mistake and they do n't gave a damn about it . But starting April , people connected to the class , began to die each month .
Kouichi Sakakibara: Does each month ? All year ?
Mei Misaki: This year I think were six students and ten relatives . Quite unusual , is n't it ? This has continued in the class three since .
Kouichi Sakakibara: Then , a third year student from the class named Misaki , died twenty - six years ago ... And starting next year , somehow , there was an additional student in class . Then , people connected to the class began to die each month . But ... Why do people die when there is a extra student ?
Mei Misaki: No one knows why . This is how it happens . Moreover , the extra _ one _ is ... someone dead .

students