#include <bits/stdc++.h>
using namespace std;
int main() {
  long long a, b, c, d, e, f, g, h, i, j, k, n, m, x, y, z;
  string s;
  cin >> s;
  long long l = s.length();
  c = 0;
  if (l == 1) {
    cout << "YES" << endl;
    return 0;
  }
  for (i = 0; i < l / 2; i++) {
    if (s[i] != s[l - 1 - i]) {
      c++;
    }
  }
  if (c == 1 || (c == 0 && l % 2 == 1))
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  return 0;
}
