Diff in UNIX

Hi guys - I have two files that have random number values and I want to see what is available in file A and not in file B

Here is what each file looks like:

File A:
 
1
45
11
788
556
 
File B:
 
774
1
5589
788
10025
 

I would like to know that File B did not had 45, 11, 556

awk 'FNR==NR {fb[$1];next} !($1 in fb)}' fileB fileA

comes as error:

 
awk: FNR==NR {fb[$1];next} !($1 in fb)}
awk:                                  ^ syntax error

sorry:

awk 'FNR==NR {fb[$1];next} !($1 in fb)' fileB fileA

thanks!