#include <bits/stdc++.h>
using namespace std;
int main() {
  char s[20];
  scanf("%s", s);
  int len = strlen(s), ans = 0;
  for (int i = 0; i < len / 2; i++) {
    if (s[i] != s[len - i - 1]) ans++;
  }
  if (ans == 1)
    printf("YES\n");
  else {
    if (ans > 1)
      printf("NO\n");
    else if (ans == 0 && (len % 2) == 0)
      printf("NO\n");
    else if (ans == 0 && (len % 2) == 1)
      printf("YES\n");
  }
  return 0;
}
