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