#define _CRT_SECURE_NO_WARNINGS

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

int main() {

char stri[100],strf[100];

int status=1;

for (int i = 0; i < strlen(stri); ++i) {

stri[i] = '\0';

strf[i] = '\0';

}

while (scanf("%s", stri) != EOF) {

for (int i = 0; i < strlen(stri); ++i) {

strf[i]=stri[strlen(stri)-1-i];

}

for (int i = 0; i < strlen(stri); ++i) {

status = 1;

if (strf[i] != stri[i]) {

status = 0;

break;

}

}

if (status) {

printf("yes\n");

}

else {

printf("no\n");

}

}

}