import socket
import base64

prefix = "cccccccc"
pad    = "c" * 15
result = ""
b      = 0

while True:
    for by in range(16):
        char = 0

        for ch in range(0x20, 0x7f):
            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            s.connect(("34.74.132.34", 1337))

            payload = prefix + pad + chr(ch) + ("c" * (15 - by))
            print(payload)
            payload = base64.b64encode(bytes(payload, encoding="ascii"))

            data = s.recv(2048)
            s.sendall(payload + b"\n")
            data = s.recv(2048)

            data = data[20:] # strip off prompts
            data = base64.b64decode(data)

            blk0 = data[16:32]
            blk1_off = 16 * (b + 2)
            blk1 = data[blk1_off : blk1_off + 16]

            if blk0 == blk1:
                char = ch
                break

        if char == 0:
            raise "BAD"

        pad = pad[1:] + chr(char)
        print(pad)

    b += 1
    result += pad
    print(f"  {result}")