Runtime Error on Uva 12874

Revision en1, by Silence_for_Melody, 2015-09-23 19:02:28

Hi, I've been trying to solve the following problem Blanket

but my code just get RTE and I don't know why, could someone help me to find my bug?

Here is my code Code

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en1 English Silence_for_Melody 2015-09-23 19:02:28 337 Initial revision (published)