Given two strings A and B. Find the longest common sequence ( A sequence which does not need to be contiguous), which is common in both the strings.
You need to return the length of such longest common subsequence.
1 <= |A|, |B| <= 1005
First argument is an string A.
Second argument is an string B.
Return the length of such longest common subsequence between string A and string B.
A = "abbcdgf" B = "bbadcgf"
The longest common subsequence is "bbcgf", which has a length of 5
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