#include <bits/stdc++.h>
using namespace std;
void reader() {}
void IOFast() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
}
void solve() {
  string s;
  cin >> s;
  long long n = s.length();
  bool dp[n][n];
  memset(dp, 0, sizeof dp);
  for (long long l = 0; l < n; l++) {
    for (long long i = 0; i < n; i++) {
      long long j = i + l;
      if (j >= n) continue;
      if (l == 0)
        dp[i][j] = 1;
      else if (l == 1 && s[i] == s[j])
        dp[i][j] = 1;
      else if (s[i] == s[j])
        dp[i][j] = dp[i + 1][j - 1];
    }
  }
  long long ans[n];
  memset(ans, 0, sizeof(ans));
  long long fans = 0;
  for (long long j = 0; j < n; j++) {
    for (long long i = 0; i <= j; i++) {
      if (dp[i][j]) {
        ans[j]++;
        if (i >= 1) fans += ans[i - 1];
      }
    }
    if (j >= 1) ans[j] += ans[j - 1];
  }
  cout << fans;
  cout << "\n";
}
signed main() {
  reader();
  IOFast();
  long long t = 1;
  while (t--) solve();
  return 0;
}

### Prompt

Please formulate a cpp solution to the following problem:

You are given a non-empty string s consisting of lowercase letters. Find the number of pairs of non-overlapping palindromic substrings of this string.

In a more formal way, you have to find the quantity of tuples (a, b, x, y) such that 1 ≤ a ≤ b < x ≤ y ≤ |s| and substrings s[a... b], s[x... y] are palindromes.

A palindrome is a string that can be read the same way from left to right and from right to left. For example, "abacaba", "z", "abba" are palindromes.

A substring s[i... j] (1 ≤ i ≤ j ≤ |s|) of string s = s1s2... s|s| is a string sisi + 1... sj. For example, substring s[2...4] of string s = "abacaba" equals "bac".

Input

The first line of input contains a non-empty string s which consists of lowercase letters ('a'...'z'), s contains at most 2000 characters.

Output

Output a single number — the quantity of pairs of non-overlapping palindromic substrings of s.

Please do not use the %lld format specifier to read or write 64-bit integers in С++. It is preferred to use cin, cout streams or the %I64d format specifier.

Examples

Input

aa


Output

1


Input

aaa


Output

5


Input

abacaba


Output

36

### Response

```cpp
#include <bits/stdc++.h>
using namespace std;
void reader() {}
void IOFast() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
}
void solve() {
  string s;
  cin >> s;
  long long n = s.length();
  bool dp[n][n];
  memset(dp, 0, sizeof dp);
  for (long long l = 0; l < n; l++) {
    for (long long i = 0; i < n; i++) {
      long long j = i + l;
      if (j >= n) continue;
      if (l == 0)
        dp[i][j] = 1;
      else if (l == 1 && s[i] == s[j])
        dp[i][j] = 1;
      else if (s[i] == s[j])
        dp[i][j] = dp[i + 1][j - 1];
    }
  }
  long long ans[n];
  memset(ans, 0, sizeof(ans));
  long long fans = 0;
  for (long long j = 0; j < n; j++) {
    for (long long i = 0; i <= j; i++) {
      if (dp[i][j]) {
        ans[j]++;
        if (i >= 1) fans += ans[i - 1];
      }
    }
    if (j >= 1) ans[j] += ans[j - 1];
  }
  cout << fans;
  cout << "\n";
}
signed main() {
  reader();
  IOFast();
  long long t = 1;
  while (t--) solve();
  return 0;
}

```