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