Cute Substrings

A string whose length is **odd** is said to be *cute* if: - Every character at an odd index (i.e. the $1$-st, $3$-rd, $5$-th, ... from the beginning) is either the letter `'u'` or the letter `'o'`; and - Every character at an even index (i.e. the $2$-nd, $4$-th, $6$-th, ... from the beginning) is the letter `'w'`. For example, $\texttt{uwu}, \texttt{o}, \texttt{owuwo}, \texttt{uwowuwo}$ are examp