#include <bits/stdc++.h>
using namespace std;
long long gcd(long long a, long long b) {
  while (a != b) {
    if (a > b)
      a = a - b;
    else
      b = b - a;
  }
  return a;
}
int solve() {
  string s;
  cin >> s;
  long long c = 0;
  for (long long i = 0; i < s.length() / 2; i++) {
    if (s[i] != s[s.length() - i - 1]) {
      c++;
      if (c > 1) {
        cout << "NO\n";
        return 0;
      }
    }
  }
  if (c == 0 && s.length() % 2 == 0) {
    cout << "NO\n";
  } else
    cout << "YES\n";
  return 0;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  { solve(); }
}
