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