Make Same

You have two strings $S$ and $T$ of lengths $N$ and $M$ respectively. In one operation, you can: - Either select a **proper** [substring](https://en.wikipedia.org/wiki/Substring) from any of the strings and delete it. In this case, remaining parts of the string are concatenated in order. - Or, copy a **proper** substring from any of the strings and append the substring at the beginning *or* en