Puzzlerium Tour: Nurikabe (Cipher)

Rules: Each different letter stands for a different non-zero integer. Shade some cells so that all shaded cells are connected and no 2×2 square is completely shaded. Cells with numbers cannot be shaded. Each group of connected unshaded cells forms an island; islands can touch each other diagonally. Each island must contain exactly one given number that indicates the number of cells inside the containing island.