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![LeetCode [easy] Replace All Digits with Characters](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2FubYOWey4M4k%2Fhqdefault.jpg%3Fsqp%3D-oaymwEjCOADEI4CSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE%3D%26rs%3DAOn4CLB8-2RwRGDQNDYU9-Pf0zKEhFBiPQ&w=256&q=75)