what's the address of these symbols with explanation and steps pls , how can I know the address of symbols?

Address Construct the symbol table for the program. .ORIG X3000 LEA R2, STRING Symbol LD R3, NUMBER HERE HERE ADD R1, R2, R3 ADD R2, R1, #0 THIS LDR RO, R1, #0 STRING BRZ DONE OUT NUMBER BR HERE THIS .BLKW 6 DONE STRING .STRINGZ "2down_3to_go" NUMBER FILL X4 DONE HALT . END