#include <bits/stdc++.h>
using namespace std;
const int MAX = 1010;
const double eps = 1e-9;
const int INF = 0x3f3f3f3f;
int dx[] = {1, 0, -1, 0};
int dy[] = {0, 1, 0, -1};
bool cmp(const pair<int, int> &A, const pair<int, int> &B) {
  return A.first < B.first;
}
int main() {
  string str;
  cin >> str;
  int cnt = 0, n = str.size();
  for (int i = 0; i < n / 2; i++) {
    if (str[i] != str[n - i - 1]) cnt++;
  }
  if (n % 2 and cnt == 0)
    cout << "YES" << endl;
  else if (cnt == 1)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  return 0;
}
