#include <bits/stdc++.h>
using namespace std;
int n, j, i;
string str;
int main() {
  cin >> str;
  if (str.length() < 4 && str.length() != 2) {
    cout << "YES";
    return 0;
  }
  if (str.length() == 2) {
    if (str[0] == str[1])
      cout << "NO";
    else
      cout << "YES";
    return 0;
  }
  j = str.length() - 1;
  while (j > i) {
    if (str[j] == str[i]) {
      i++;
      j--;
    } else {
      n++;
      i++;
      j--;
    }
  }
  if (str.length() % 2 == 0 && n == 0)
    cout << "NO";
  else if (j - i == 1) {
    if (str[i] != str[j] && n >= 1)
      cout << "NO";
    else
      cout << "YES";
  } else {
    if (n <= 1)
      cout << "YES";
    else
      cout << "NO";
  }
  return 0;
}
