def place(grid, x, y, mark):
    if 0 <= y < len(grid) and 0 <= x < len(grid[0]):
        grid[y][x] = mark

grid = [["." for _ in range(11)] for _ in range(11)]
x, y = 5, 5
place(grid, x, y, "X")
place(grid, x - 1, y, "L")
place(grid, x + 1, y, "R")
for row in grid:
    print("".join(row))

# Extended practice block for medium level.
dataset_1 = [9, 11, 13]
def checkpoint_shapes_1(values):
    normalized = [value - min(values) for value in values]
    weighted = [value * (1 + 1) for value in normalized]
    pairs = list(zip(values, weighted))
    total = sum(weighted)
    average = round(total / len(weighted), 3)