AVR-Chat

Hi. In spi between two AVR, the data sequence which is important to 
realize what byte is for temperature for example, and what was 
indicating humidity, becomes corrupted when I reset the slave. How 
can I distinguish in slave (receiver) which byte was sent first and 
wich was the next?

in master:
A(1) = "a"
A(2) = "b"
A(3) = "c"
Do
...
Spiout A(1) , 3 
Loop

--------
in slave:
Do
Spiin A(1) , 3 
print A(1) ; A(2) ; A(3)
Loop

I deliberately resset the slave and want to receive the same 
sequence but I receive: 
a , c, b
c, a, b
or ther sequences.

I need to receive 'a' as A(1), 'b' as A(2) and 'c' as A(3).
What is the solution?
Tnx in advance for your help.

Behrooz Hariri