function bomberMan(n, grid) {
    let row = grid.length, column = grid[0].length
    let arr1 = Array.from(Array(grid.length), () => new Array(grid[0].length).fill('O'))
    if (n == 1)
        return grid
    if (n % 2 == 0) {
        for (let i = 0; i < row; i++)
            arr1[i] = arr1[i].join("")
        return arr1
    }
    function boom(cur) {
        let arr = Array.from(Array(row), () => new Array(column).fill('O'));
        for (let r = 0; r < row; r++) {
            for (let c = 0; c < column; c++) {
                if (cur[r][c] == 'O') {
                    arr[r][c] = "."
                    if (r + 1 < row)
                        arr[r + 1][c] = '.'
                    if (r - 1 >= 0)
                        arr[r - 1][c] = '.'
                    if (c + 1 < column)
                        arr[r][c + 1] = '.'
                    if (c - 1 > -1)
                        arr[r][c - 1] = '.'
                }
            }
        }
        for (let i = 0; i < row; i++)
            arr[i] = arr[i].join("")
        return arr
    }
    let first = boom(grid)
    let second = boom(first)
    return (n % 4 == 3) ? first : second

}