每天下课老师都会给某个学生进行课外辅导。由于时间有限，所以老师只能辅导一名知识掌握程度最低的同学。如果有多名同学知识掌握程度最低，则选编号最小的同学进行辅导。该同学在接受辅导后提升了知识掌握程度。老师想知道他每天辅导的同学的编号。 -Daily class teacher to a student after school tutoring. Due to limited time, so the teacher can only counseling a knowledge to gras