#include <bits/stdc++.h>
using namespace std;
char s[106];
int main() {
  int biao, q, len;
  memset(s, 0, sizeof(s));
  while (scanf("%s", s + 1) == 1) {
    biao = 0;
    q = 0;
    len = strlen(s + 1);
    if (len == 1) {
      printf("YES\n");
      continue;
    }
    for (int i = 1; i <= len / 2; i++) {
      if (s[i] == s[len - i + 1]) {
        continue;
      } else {
        q++;
      }
    }
    if (q == 1 || (q == 0 && len % 2 == 1))
      printf("YES\n");
    else
      printf("NO\n");
    memset(s, 0, sizeof(s));
  }
}
