Solving Sunshine CTF 2019's Time Warp challenge.

timeWarp.py

from socket import socket

nums = []

def recv(sock):
    try: data = sock.recv(1024).decode()
    except: data = ""
    print(data)
    return data

while True:
    sock = socket()
    sock.settimeout(0.1)
    try:
        sock.connect(('archive.sunshinectf.org', 19004))
    except:
        print("Could not connect... retrying")
        sock.close()
        continue
    print(recv(sock))
    print(recv(sock))
    for index, num in enumerate(nums):
        print(str(num)+", "+str(index)+"/"+str(len(nums)))
        sock.send((num+"\n").encode('utf-8'))
        congratsText = recv(sock)
        congratsText += recv(sock)
    sock.send("0\n".encode('utf-8'))
    sock.settimeout(0.3)
    resp = recv(sock)
    sock.settimeout(0.1)
    givenNum = resp.split("\n")[0]
    if givenNum.isdigit():
        nums.append(resp.split("\n")[0])
        print("Current:"+', '.join(nums))
    else:
        print("Error in response:"+givenNum)
    sock.close()