71728
At this time the games tended to be low scoring , dominated by such pitchers as Walter Johnson , Cy Young , Christy Mathewson , and Grover Cleveland Alexander to the extent that the period 1900 – 1919 is commonly called the " Dead-ball era " .
 person: Walter Johnson; person: Cy Young; person: Christy Mathewson; person: Grover Cleveland Alexander
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Walter Johnson, Cy Young, Christy Mathewson, Grover Cleveland Alexander 
Answer:
 person: Walter Johnson; person: Cy Young; person: Christy Mathewson; person: Grover Cleveland Alexander