import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Sample{
  public static void main(String[] args){
    try{
      System.out.println("[START]");
      BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
      String line;
      System.out.print("[IN]:");
      while((line = reader.readLine()) != null){
        System.out.println("[OUT]:"+line);
        System.out.print("[IN]:");
      }
      reader.close();
      System.out.println("[END]");
    }catch(Exception e){
      e.printStackTrace();
      System.exit(-1);
    }
  }
}

import signal

print('exit: Ctrl + c')

def handler(signal, frame):
  exit()

signal.signal(signal.SIGINT, handler)
while True:
  pass
  input_msg = input('[input_msg]:')
  if input_msg == '':
    continue
  output_msg = '[output_msg]:' + input_msg
  print(output_msg)

<?php
print("exit: Ctrl + c" . PHP_EOL);
while(true) {
	print('[input_msg]:');
	$input_msg = trim(fgets(STDIN));
	if($input_msg == ''){ continue; }
	$output_msg = "[output_msg]:" . $input_msg;
	print($output_msg . PHP_EOL);
}