#include <bits/stdc++.h>
int main() {
  char s[15];
  scanf("%s", &s);
  int len, r = strlen(s), count = 0, i, j;
  len = (r / 2);
  j = r - 1;
  for (i = 0; i < len; i++) {
    if (s[i] != s[j]) {
      count++;
    }
    j--;
  }
  if (count == 1)
    printf("YES\n");
  else if (count == 0 && r % 2 != 0)
    printf("YES\n");
  else
    printf("NO\n");
}
