#include <bits/stdc++.h>
using namespace std;
void solve() {
  string s1, s2;
  cin >> s1;
  s2 = s1;
  reverse(s2.begin(), s2.end());
  int countC = 0;
  for (int i = 0; i < s1.size() / 2; ++i) {
    countC += (s1[i] != s2[i]);
    if (s1[i] != s2[s1.size() - i - 1]) countC++;
  }
  if (countC == 1 || (countC == 0 && s1.size() % 2))
    cout << "YES";
  else
    cout << "NO";
}
int main() {
  ios_base::sync_with_stdio(false);
  cout.setf(ios::fixed);
  cout.precision(9);
  solve();
  return 0;
}
