Missing a message from TCPClient

Question

I am new into Python and socket programming. This is my TCPClient code.

from socket import *
serverName = 'localhost'
serverPort = 12000
clientSocket = socket(AF_INET, SOCK_STREAM)

clientSocket.connect((serverName, serverPort))

sentence = input('Input lowercase sentence :')
clientSocket.send(sentence.encode())
modifiedSentence = clientSocket.recv(1024)

print('From server', modifiedSentence.decode())

clientSocket.close()

The message that should be displayed when I run the code should be :

1. Input lowercase sentence : message (example sentence)
2. From server MESSAGE

But only 1. was displayed, 2. wasnt even there.

Can someone point out my mistake?

This is my TPCServer code anyway.

from socket import *
serverName = 'localhost'
serverPort = 12000

serverSocket = socket(AF_INET, SOCK_STREAM)
serverSocket.bind((serverName, serverPort))

serverSocket.listen(1)

print('The server is ready to receive.')

while True:
    connectionSocket, addr = serverSocket.accept()
    sentence = connectionSocket.recv(1024)