import random
from socket import *
serverSocket = socket(AF_INET, SOCK_DGRAM)
serverSocket.bind(('', 12000))
while True:
	rand = random.randint(0, 10)
	message, address = serverSocket.recvfrom(1024)
	message = message.upper()
	if (rand < 4):
		continue
	serverSocket.sendto(message, address)