A9072. Lucky Common Subsequence

In mathematics, a subsequence is a sequence that can be derived from another sequence by deleting some elements without changing the order of the remaining elements. For example, the sequence BDF is a subsequence of ABCDEF. A substring of a string is a continuous subsequence of the string. For example, BCD is a substring of ABCDEF.

You are given two strings $s_{1}$ , $s_{2}$ and another string called $virus$ . Your task is to find the longest common subsequence of $s_{1}$ and $s_{2}$ , such that it doesn't contain $virus$ as a substring.

The input contains three strings in three separate lines: $s_{1}$ , $s_{2}$ and $virus$ ( $1<=|s_{1}|,|s_{2}|,|virus|<=100$ ). Each string consists only of uppercase English letters.

Output the longest common subsequence of $s_{1}$ and $s_{2}$ without $virus$ as a substring. If there are multiple answers, any of them will be accepted.

If there is no valid common subsequence, output 0.