With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Leyton Orient F.C. is in the ocean.
text_B: The Maraton Alpino Madrileno or Madrid Alpine Marathon is a trail running race that takes place on Sierra de Guadarrama , in Madrid -LRB- Spain -RRB- , in mid-June .. trail running. trail running. race. racing. Sierra de Guadarrama. Sierra de Guadarrama. Madrid. Madrid. Spain. Spain. This race covers nearly 45 km with 4700 m of altitude change .. race. racing. Since 2006 , the start and the end points of the race are located in Cercedilla , and its course goes through Alto del Telegrafo , Puerto de Navacerrada , Bola del Mundo -LRB- also known as Alto de las Guarramillas -RRB- , Puerto de Cotos , Pico Penalara -LRB- the highest point of Madrid -RRB- and the glacial Penalara lakes .. race. racing. Madrid. Madrid. Cercedilla. Cercedilla. Alto del Telegrafo. Alto del Telegrafo. Puerto de Navacerrada. Puerto de Navacerrada. Bola del Mundo. Bola del Mundo. Alto de las Guarramillas. Alto de las Guarramillas. Puerto de Cotos. Puerto de Cotos. Pico Penalara. Penalara. glacial Penalara lakes. Penalara Nature Reserve. The Tierra Tragame club is in charge of organizing this race .. race. racing. The Maraton Alpino Madrileno belongs to several different competition circuits , as Circuito Alpino , Buff Skyrunning World Trail Series .
not_related.