import socket

s = socket.socket()
host = socket.gethostname()
port = 12345
s.bind((host, port))
s.listen()

while True:
    (connection, addr) = s.accept()

    msg = connection.recv(1024)
    msgReturn = msg.decode('utf-8').upper()
    connection.send(msgReturn.encode('utf-8'))
    connection.close()