10508
In his first season with the club , he managed to save the club that was staring relegation in the face after the disastrous reigns of his two predecessors , Christian Gross and Jens Keller , ended in the last quarter of 2010 .
 person: Christian Gross; person: Jens Keller
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Christian Gross, Jens Keller 
Answer:
 person: Christian Gross; person: Jens Keller