The InputStr command allows you to input a string to a variable. Since Input doesn't support the storing of strings into variables, you have to use this command to do that. Keep in mind that the inputted variable cannot be the name of a preexisting variable or flash application that is locked, protected, or archived. For example, if you had a program named "a" or "hello", the command wouldn't work because it is already in use.
InputStr A //Here, you would a string to be stored to the variable A InputStr hello //This would store the string into the variable "hello".
980 - Variable is locked, protected, or archived happens when the user attempted to redefine/modify an already defined variable.