Ambiguous verdict

Revision en1, by Least_but_not_the_last, 2018-03-17 14:45:48

I'm trying to solve this problem in csacademy. I solved it in C++ but translating the same code in python 3 gets "Non zero exit code = 1" verdict. What does it mean? I have experienced this verdict first time & got no explanation anywhere C++_code: Python_3_code:

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en2 English Least_but_not_the_last 2018-03-17 16:16:03 150
en1 English Least_but_not_the_last 2018-03-17 14:45:48 417 Initial revision (published)