Its capital is ChÃ cents lons-en-Champagne , which was known as ChÃ cents lons-sur-Marne until 1998 . British comedian Eddie Izzard mentions ChÃ cents lons-en-Champagne ( at the time known as ChÃ cents lons-sur-Marne ) on his stand-up album Definite Article , as part of a routine in which he tells of his school exchange trip to ChÃ cents lons-sur-Marne , one of the highlights of which was a visit to a glue factory .