from pwn import *

solns = ['(?i)s.*e.*l.*e.*c.*t',
         '^(a\g<1>*b)$',
         r'(?!(xx+)\1+$)^xx+$',
         r'^((.)\g<1>\2|.?)$',
         r'^(?=(a\g<1>?b)c)a+(b\g<2>?c)$',
         ""]

r = remote('52.69.125.71',2171)

for s in solns:
    crap = ""
    while "=" not in crap:
        crap = r.recv()
        print crap
    r.send(s + "\n")

print r.recv()