"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
"1234567890" \
"ñÑáéíóúÁÉÍÓÚäëïöü"\
"!¡?¿@#$%&'+-=><*/,.:;-_()[]{}|^`~\\"\
"!¡?¿@#$%&'+-=><*/,.:;-_()[]{}|^`~"\
"àèìòùâêîôû";
if (letra == ' ' || letra == '\0' || letra == '\n')