Xiao Ming wants to use 105 square cards of the same size to form a rectangle. How many different spellings are there? (Hint: first use the grouping method to find out the factors of 105, and each group of two factors is used as the length and width of the rectangle)
小明想用105张大小相同的正方形卡片拼成一个长方形，有多少种不同的拼法？(提示：先用分组法找出105的因数，每组两个因数分别作为长方形的长和宽)
<result>4</result>