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