#include <stdio.h>
#include <string.h>

int main()
{
	char s[1000];
	while(gets(s) != NULL)
	{
		char *p,*q;
		p = s;
		q = s;
		while(*q != '\0')
			q++;
		q--;
		while(p < q && *p == *q) p++,q--;
		if(p >= q) printf("Yes!\n");
		else printf("No!\n");
			
	}
	return 0;
}