#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, difference = 0;
  string s;
  cin >> s;
  s = '#' + s;
  n = s.length() - 1;
  for (int i = 1; i + i <= s.length() - 1; i++) {
    if (s[i] != s[s.length() - i]) difference++;
  }
  if (difference == 1 || (difference <= 1 && (n & 1)))
    cout << "YES\n";
  else
    cout << "NO\n";
  return 0;
}
