For example, consider a sample configuration of students - ><. Here students numbered 1 and 4 are busy studying, while the student 2 and 3 are talking to each other. In this example, ><><, student 1 and 2 are talking to each other, and 3 and 4 are also talking to each other.
You are guaranteed that the given input is a valid configuration, i.e. <> can not be a valid string s, as here student 1 is shown to be talking to left, but there is no student to the left. Same is the case for right. Similarly, >><< is also not a valid configuration, as students 2 and 3 are talking to each other, so student 1 won’t be able to talk to student 2.
Please Tell me the meaning of bolted text