n = int(input("输入行数量："))
m = int(input("输入每行字符数量："))

# 计算行和列的中间位置
mid_row = n // 2
mid_col = m // 2

for i in range(n):
    # 判断当前行是否为中间行（或中间两行）
    if _____________________________________:
        print('*' * m)
    else:
        # 根据列数奇偶性构建行字符串
        if m % 2 == 1:
            # 奇数列：左侧- + 中间* + 右侧-
            left = '-' * mid_col
            center = '*'
            right = '-' * mid_col
            print(left + center + right)
        else:
            # 偶数列：左侧- + 中间** + 右侧-
            left = '-' * (mid_col - 1)
            center = '**'
            right = '-' * (mid_col - 1)
            print(left + center + right)