two Tshirt size give b the Tshirt size string M string consist possibly zero character x character S LFor example string M XXL S XXXXXXXS size tshirt and string XM LL SX sizesThe letter M stand medium S small L large the letter x refer degree size eXtra for example XXL extraextralarge big XL small XXXLYou need compare give size Tshirts bThe Tshirts compare follow small size matter letter x small medium size large size large size regardless number letter x large medium size small size letter X S small size letter X L large size for example XXXS XS XXXL XL XL M XXL XXL XXXXXS M XL xxxs