#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  string s;
  cin >> s;
  long long i, j, n, cnt = 0;
  n = s.size();
  for (i = 0, j = n - 1; i < n / 2; ++i, --j) {
    if (s[i] != s[j]) cnt++;
  }
  if (cnt == 0 && n % 2 == 0)
    cout << "NO" << '\n';
  else if (cnt <= 1)
    cout << "YES" << '\n';
  else
    cout << "NO" << '\n';
  return 0;
}
