23414번 - Removing Pairs 다국어

The pair removal operation is removing two adjacent characters from a string. For example, given the string "abcd", we can obtain "ab", "ad", and "cd" by pair removal.

You are given a string $t$. You can apply pair removal any number of times. Is it possible to obtain the string $s$?

The first line contains the string $s$, and the second line contains the string $t$ ($1 \le |s| \le |t| \le 10^5$). Both strings are composed of lowercase letters of English alphabet.

Print "YES" if it is possible to obtain $s$ from $t$ using pair removal, or "NO" otherwise.

In the first test, one of the possible pair removal sequences is the following:

• abcbcxdda
• abcxdda
• abcxa
• axa