#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  string str;
  cin >> str;
  int mid = str.length() / 2;
  int diff = 0;
  for (int i = 0; i < mid; i++) {
    if (str[i] != str[str.length() - i - 1]) {
      diff++;
    }
  }
  if (diff == 1 || (diff == 0 && str.length() % 2 != 0)) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}
