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