题目大意：比较衣服的大小，S前面的X会让S更小，L前面的X会让L更大。M比L小，M比S大

Two T-shirt sizes are given: aa and bb. The T-shirt size is either a string M or a string consisting of several (possibly zero) characters X and one of the characters S or L.

For example, strings M, XXL, S, XXXXXXXS could be the size of some T-shirts. And the strings XM, LL, SX are not sizes.

The letter M stands for medium, S for small, L for large. The letter X refers to the degree of size (from eXtra). For example, XXL is extra-extra-large (bigger than XL, and smaller than XXXL).

You need to compare two given sizes of T-shirts aa and bb.

The T-shirts are compared as follows:

• any small size (no matter how many letters X) is smaller than the medium size and any large size;
• any large size (regardless of the number of letters X) is larger than the medium size and any small size;
• the more letters X before S, the smaller the size;
• the more letters X in front of L, the larger the size.

For example:

• XXXS < XS
• XXXL > XL
• XL > M
• XXL = XXL
• XXXXXS < M
• XL > XXXS