text: #!/usr/bin/env node
  
  /**
   * Filter input lines. Output lines that contain only characters from the lower
   * part of the ASCII set on stdout (everything under 128) and any lines that
   * contain characters from 128 and higher on stderr.
   */
  
  var readline = require('readline');
  
  var rl = readline.createInterface({ input: process.stdin });
  
  var i;
  
  rl.on('line', function(line) {
    var ok = true;
    for (i = 0; i < line.length; i++) {
      if (line.charCodeAt(i) > 127) {
        ok = false;
        i = line.length;
      }
    }
    if (ok) {
      console.log(line);
    } else {
      console.error(line);
    }
  });
  