Unique Filter from one spreadsheet to another

[DDT123]

Greetings - I have 2 worksheets, worksheet one has a list of contract numbers in column A, and worksheet two has a list of contract numbers in column B. On a blank worksheet (worksheet three), I'm needing the formula which will compare worksheets one and two, then list the contract numbers from spreadsheet two which weren't listed on spreadsheet one.

Thanks in advance.

 

[dreid1011]

Perhaps this:
Sheet 1:

Book1
	A
1	Contract #
2	352
3	821
4	487
5	123
6	420
7	838
8	378
9	598
10	734
11	864
12	843
13	260
14	638
15	112
16	726
17	518
18	758
19	410
20	356
21	234
Sheet1

Sheet 2 (col C for reference to show which numbers do not match sheet 1):

Book1
	A	B	C
1		Contract #
2		477	#N/A
3		821	2
4		487	3
5		778	#N/A
6		148	#N/A
7		252	#N/A
8		123	4
9		581	#N/A
10		568	#N/A
11		963	#N/A
12		410	18
13		356	19
14		234	20
15		419	#N/A
16		235	#N/A
17		781	#N/A
18		795	#N/A
19		112	14
20		406	#N/A
21		168	#N/A
Sheet2

Cell Formulas
Range	Formula
C2:C21	C2	=MATCH(B2,Sheet1!$A$2:$A$21,0)

Sheet 3:

Book1
	A
1	Contract #
2	477
3	778
4	148
5	252
6	581
7	568
8	963
9	419
10	235
11	781
12	795
13	406
14	168
Sheet3

Cell Formulas
Range	Formula
A2:A14	A2	=FILTER(Sheet2!B2:B21,ISNA(MATCH(Sheet2!B2:B21,Sheet1!$A$2:$A$21,0)))
Dynamic array formulas.