import 'dart:io';

void main(List<String> arguments) {
  stdout.write('Press any key to continue...');

  while (true) {
    int charCode = stdin.readByteSync(); // Read a single byte
    String char = String.fromCharCode(charCode).toLowerCase(); // Convert byte to character and lowercase it

    // Check if the input is "Enter" or between 'a' and 'z'
    if (charCode == 10 || (char.compareTo('a') >= 0 && char.compareTo('z') <= 0)) {
      break; // Exit loop if valid input is received
    }
  }

  print(''); // Print a newline for formatting
}