#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  int count1 = 0;
  int len = s.length();
  int half = (len + 1) / 2;
  for (int i = 0; i < half; i++) {
    if (s[i] == s[len - i - 1]) {
      count1++;
    }
  }
  if (count1 == half - 1) {
    cout << "YES" << endl;
  } else if (count1 == half && len % 2 != 0) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}
