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ErrUchIsDown error

My solution works well and generates right answer, but can't pass Test 2/2 (result "RRRRRRRR") due to ErrUchIsDown. What's the problem?

Created: July 19, 2016, 3:43 p.m.
Updated: July 20, 2016, 4:03 a.m.
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Ivan_Shamanaev