输入：num = "1432219", k = 3
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In addition, the Sleep A20 offer up to 14 hours of battery life and sleep tracking, providing insights into how long and how well you’ve slept via a companion app that also details your sleep positions and movements. The newer Soundcore Sleep A30 feature active noise cancellation, which is more effective at masking sounds than the A20’s passive isolation, but Anker’s last-gen earbuds remain a decent, budget-friendly option that can help you comfortably tune out most nighttime distractions for nearly half the price.
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