#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main() {
    char s[1001];
    fgets(s,1001,stdin);
    char clean[1001];
    int k = 0;
    for(int i = 0;s[i];i++) {
        if(isalnum(s[i])) {
            clean[k++] = tolower(s[i]);
        }
    }
    clean[k] = '\0';
    int left = 0,right = k -1;
    while(left < right) {
        if(clean[left]!= clean[right]) {
            printf("NO");
            return 0;
        }
    }
    left++;
    right--;
  }
   printf("YES");
   return 0;
}