#include <stdio.h>
#include <ctype.h>
#include <string.h>
int main()
{
    char a[100];
    int left,right;
    if(scanf("%[^\n]s",a)!=1){
        printf("Invalid input");
        return 0;
    }
    left=0;
    right=strlen(a)-1;
    while(left<right){
        if(!isalnum(a[left])){
            left++;
            continue;
        }
         if(!isalnum(a[right])){
            right--;
            continue;
        }
    }
    if(tolower(a[left])!=tolower(a[right])){
        printf("No\n");
        return 0;
    }
}
    left++;
    right--;
    printf("Yes\n");
    return 0;
}