Input (grade 10): Since 1867, Tornero was the only editor of El Mercurio de ValparaÃ so until 1870, when he partnered with Camilo Letelier.
Output (grade 5): Tornero was the only editor of El Mercurio de ValparaÃ so from 1867 to 1870. In 1870, he partnered with Camilo Letelier.