When I perform diff between old to new files
I get that DDDC string exsist in the old file by the sign "<" as the follwoing

```
diff -w old   new
103a104
> BBB
224c225
< DDDC

```

But please advice if diff can display only the string DDDC from the old file without the sign as "<" or ">" or some numbers as 103a104 or 224c225 etc and all that silly things

For example (requested output from diff hope it realistic - 

```
diff -w old new
DDDC

```

I need to get the following format (only the strings that exists in the old file and not appears in the new file)