Format changing in CSV File

[ianicr]

I have a CSV file with the following in:

Mr,John,Smith,0121-1234567
Mr,Gryff,Rhys-Jones,0121-2345678

Is there a way to remove the hyphen from the last field but not the surname field? I've tried a tr -d "-" on the file but this removes all the hyphens. Any ideas?
Thanks

 

[vgersh99]

nawk -f ian.awk ian.txt

#-------------- ian.awk
BEGIN {
FS=OFS=","
}

{
gsub("-", "", $NF);
print
}


vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+