#include <stdio.h>
#include <string.h>
int main() {
    char a[2000];
    while (scanf("%s ", a) != EOF) {
        int i=strlen(a);int j=0;i=i-1;int tag=1;
        while(1){
            if(a[i]!=a[j]){
                tag=0;
                break;
            }
            i--;j++;
            if(i<=j)break;
        }
        if(tag==1){printf("Yes!\n");}
        else{printf("No!\n");}
    }
    return 0;
}