Rohan and his team are participating in the Treasure Hunt event of college in which in each step they have to solve one problem to get a clue of Treasure location. Rohan's team has performed very well and reached the final step where they have to provide a code of a problem to get a final clue about treasure. Given a string s, they need to find the longest palindromic subsequence's length in s. A subsequence is a sequence that can be derived from another sequence by deleting some or no elements without changing the order of the remaining elements. The string contains only lowercase letters. Write a program to help Rohan's team that takes in input as String x and returns the length of the longest palindromic subsequence of x. Input Specification: input1: string input Output Specification: Return the length of the longest palindromic subsequence

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