Scanning Next Line Of Input Without Advancing Past Line

I'm doing an assignment for uni and have come across a small hiccup. What I'm trying to do is scan in a text file and read "commands" for it line by line, E.g:

Student Mary 12345 19
Student Joe 12346 19
Change Joe 19 20
Change Mary 19 20

So that lines that begin with the word "Student" indicate that I should create a new student file with that name, student ID, and age.

"Change" indicates that I should be changing the specified student's current age to the new age etc.

What I'm currently doing is something along the lines of this:

Scanner input = new Scanner(new FileReader(args[0]));
String[] line;
while (input.nextLine().startsWith("Student")) {
line = input.nextLine().split("s+");

[Code] ....

The problem I'm having is that every second line seems to be getting skipped (because I'm calling nextLine() so much?) but I can't think of a way to "peek" at the first word of each line without advancing past it. Is there any way of doing this?