#include <bits/stdc++.h>
using namespace std;
void rvi(vector<int> &v, int n) {
  v.clear();
  int temp;
  for (int i = 0; i < n; i++) {
    scanf("%d", &temp);
    v.push_back(temp);
  }
}
void rvll(vector<long long int> &v, int n) {
  v.clear();
  long long int temp;
  for (int i = 0; i < n; i++) {
    scanf("%lld", &temp);
    v.push_back(temp);
  }
}
int main() {
  int n;
  string str;
  cin >> str;
  n = str.size();
  int l = 0, r = n - 1, cnt = 0;
  while (l <= r) {
    if (str[l] == str[r]) {
      l++;
      r--;
    } else {
      cnt++;
      l++;
      r--;
    }
  }
  if (cnt == 1)
    printf("YES\n");
  else if (cnt == 0) {
    if (n % 2)
      printf("YES\n");
    else
      printf("NO\n");
  } else
    printf("NO\n");
  return 0;
}
