Character

Personal Rating: Easy

You can send a 0 to get the flag char at index 0 and so on. I wrote a script to get the flag:

#!/bin/bash

for i in {0..103};do echo ${i} >> senddata.txt; done
timeout 1 nc -nvv 94.237.62.117 38517 < senddata.txt | tee output.txt &>/dev/null
rev output.txt | cut -c -1 | rev | tr -d '\n'
echo ''
rm output.txt
rm senddata.txt

Connection to 94.237.62.117 38517 port [tcp/*] succeeded!

HTB{tH15_1s_4_r3aLly_l0nG_fL4g_i_h0p3_f0r_y0Ur_s4k3_tH4t_y0U_sCr1pTEd_tH1s_oR_els3_iT_t0oK_qU1t3_l0ng!!}