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