1970
-DOCSTART- RT @TomAbrahams13 : Close to 5k at Houston GRB shelter . More coming . None turned away . # HurricaneHarvey # ABC13Eyewitness https://t.co/qUBCl5ZXW4
 GRB
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: exact location, area, road, river 
Text: {0} 
Answer:
 GRB