求助：PS要求

它家网申里面说PS的要求是： Your Personal Statement should be a brief but carefully written essay regarding: 1) the reasons you want to do graduate work in this particular field, 2) your specific interests and experiences in this field, 3) any special skills or experiences that may relate to an assistantship, and 4) your career plans.
有没有哪里写清楚是多少字数呀？我准备了两版PS，一版890字的，一版500字的，不知道提交哪个了呃。。。