#include <bits/stdc++.h>
using namespace std;
const int N = 1100;
int n, a[N];
int main() {
  ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
  string s;
  cin >> s;
  n = s.size();
  int res = 0;
  for (int i = 0, j = n - 1; i < j; i++, j--) res += (s[i] != s[j]);
  cout << (res == 1 || (res == 0 && n % 2) ? "YES" : "NO") << endl;
  return 0;
}
