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'.

Example Input: Sentence 1:David Williams , the sole survivor of the trio that captured Major John Andre , died in 1831 . Sentence 2:nan
Example Output: SINGLE_APPOSITION

Example Input: Sentence 1:Ricky 's receding hairline is giving him much concern , so Lucy decides to give him painful scalp treatments . Sentence 2:nan
Example Output: SINGLE_S_COORD_ANAPHORA

Example Input: Sentence 1:Noticing the support Crow gets from the children , Broder explains how he came across a similar group of children , expressing his desire to fight Yliaster in order to protect them . Sentence 2:nan
Example Output:
SINGLE_CATAPHORA