UNIX for Advanced & Expert Users

Hi, can any one please assist me, I tried doing diff file1 file2, but does not get the require output.

File1:
apple
mango
peas

File2:
carrot
mango
apple
123

Q. Match the two files such that, if any word present in file1, for ex peas, does not matches to file2 then it should go to file3, and similarly if any word present in file2, for ex carrot, does not matches to file1 then it should go to file4. Note that the words are random.

Result expected:
File3:
peas

File4:
carrot
123

File5(match):
apple
mango

Thankyou.

You may want to use the comm command instead with -13 and -23 flags. Also, before any comparison (using comm or diff or etc), I suggest you also sort the file first