function runLengthEncoding(text: string): string {
  let counter: number = 1;
  let output: string = "";
  
  for ( let i = 0; i < text.length; i++) {
    if (text[i] == text[i+1]) {
      counter++;
    } else {
      output+=`${counter}${text[i]}`;
      counter = 1;
    }
  }

  return output;
}

// No modificar: necesario para evaluar el resultado.
export { runLengthEncoding };