In this task, you are given two sentences in the English language and your task is to classify them into one of their discourse types. A discourse type is an indicator to classify the given two sentences on the basis of a co-text as well as a relevant context. There are 13 discourse types in total which are 'SINGLE_S_COORD', 'SINGLE_CATAPHORA', 'SINGLE_CONN_INNER', 'SINGLE_APPOSITION', 'SINGLE_VP_COORD', 'SINGLE_CONN_START', 'PAIR_ANAPHORA', 'PAIR_CONN', 'SINGLE_RELATIVE', 'SINGLE_CONN_INNER_ANAPHORA', 'SINGLE_S_COORD_ANAPHORA', 'PAIR_CONN_ANAPHORA' and 'PAIR_NONE'.

Ex Input:
Sentence 1:Packing to leave , she receives a telegram from her husband saying that Stroh will explain the misunderstanding . Sentence 2:nan

Ex Output:
SINGLE_CATAPHORA


Ex Input:
Sentence 1:It was created because people wanted to cross the Asian game breeds with old English game to create a fantastic fighter . Sentence 2:However , what they got ( though not the right build for fighting ) was a fantastic meat bird .

Ex Output:
PAIR_CONN_ANAPHORA


Ex Input:
Sentence 1:Although Bernstein left as music director in 1969 , he continued to lead the Young People 's Concerts as Conductor Emeritus until 1972 . Sentence 2:nan

Ex Output:

SINGLE_CONN_START