Comparing columns and returning value

Hello,

I had similer proble which was discussed at

https://ccm.net/forum/affich-100231-comparing-columns-and-returning-value

but with little change.

My data is

Sheet1

Column A Column B
1 a
2 e
3 b
4 c
5 d
6 f

and Sheet2
Column A Column B
a formule
b
c
d
e
f
g
h
i

what i want in column B of sheet2 is, compare column A of sheet 2 with column B of sheet1 and put a corresponding value of column A of sheet 1
example:

Column A Column B
a 1
b 3
c 4
d 5
e 2
f 6
g 0
h 0
i 0

g, h and i = 0 as there is no match for it in sheet 1.

Thanks in advonce

Suraj.