Detailed Instructions: In this task you're given two statements in Hindi. You must judge whether the second sentence is the cause or effect of the first one. The sentences are separated by a newline character. Output either the word 'cause' or 'effect'.
Q: ट्रेन के अंदर अंधेरा हो गया। 
 ट्रेन एक सुरंग से होकर गुजरी।
A:
cause