#include<stdio.h>
#include<string.h>
#define n 30
int main()
{
    char s[n];
    int i,j;
    while(scanf("%s", s)==1)
    {
        int p=1;
        for(i=0;i<strlen(s+1)/2;i++)
        {
            if(s[i]!=s[strlen(s)-i-1])
            {
                p=0;
                printf("No!");
            }
            if(p)
            {
                printf("Yes!");
            }
        }
    printf("\n");
    }
    return 0;
}