Warning! There are spoilers ahead
You can use the netcat program on your computer to listen, and the grep program to wait for the flag.
$ nc localhost 8080 | grep flag
part 0 of 6 of the flag is: hackDal
part 1 of 6 of the flag is: ton{gr3
part 2 of 6 of the flag is: p_1s_4_
part 3 of 6 of the flag is: us3ful_
part 4 of 6 of the flag is: t00l_si
part 5 of 6 of the flag is: 1EldtNcQ}As you can see, the flag is hackDalton{gr3p_1s_4_us3ful_t00l_si1EldtNcQ}.