i need help doing this i am slightly confused as to how to do this....Please help

Assembly language programming: input and output. The TRAP service routines GETC and IN each collect only a single character of input at a time. However, the TRAP service routines OUT and PUTS, generate one or a string characters of output, respectively. Write an LC-3 assembly language program that collects many characters of input at a time. In other words, write a service routine (GETS) that gets a string of characters from the keyboard, stores the string in a contiguous block of memory, and loads R0 with the memory address of the beginning of the string. The end of the character string is indicated by a newline character, which is generated when the user presses the ENTER key on the keyboard. Your program should not use any TRAP service routines other than HALT. Update the trap vector table to define trapvector x26, and make a home for your GETS subroutine a memory location x0600. Finally, write a program that uses TRAP x26 to make sure it works.

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[code]

.ORIG X3000
AND R0, R0, #0
AND R1, R1, #0
AND R2, R2, #0
AND R3, R3, #0
AND R4, R4, #0
LEA R0, MSG1
PUTS

AGAIN GETC; write the code getc
ST R0, CHARS
OUT; write the code for out function
ADD R2, R0, #0
LD R3, NUMBERS
ADD R2, R2, R3
BRz STOP

BRnzp AGAIN
STOP

LD R0, CHARS

OUT
HALT ;STOP PROGRAM
;*************************************...
MSG1 .STRINGZ "Please enter a character string >"
MSG2 .STRINGZ "Forward string >"
MSG3 .STRINGZ "Backward string >"
CHARS .BLKW 10
ASCII .FILL #-48
NUMBERS .FILL #-10
.END
[code/]