Palindrome Pain

You are given two integers $X$ and $Y$. You need to construct two different strings $S_1$ and $S_2$ consisting of only the characters $‘a’$ and $‘b’$, such that the following conditions are satisfied: 1. Both $S_1$ and $S_2$ are [palindromes](https://en.wikipedia.org/wiki/Palindrome). 2. Both $S_1$ and $S_2$ should contain exactly $X$ occurrences of $\texttt{a}$ and $Y$ occurrences of $\texttt{b}