the new camp widelyknown country Spring Programming Camp go start soon hence team friendly curator teacher start compose camp schedule after continuous discussion come schedule s represent binary string ith symbol 1 student write contest ith day 0 day offat moment Gleb say camp productive run schedule t describe format schedule s since number day current different number day schedule t Gleb require camp schedule alter number occurrence t substre maximum possible at time number contest day day should not change order changecould rearrange schedule well possible way