// 20:50 - 21:00
#include <stdio.h>
#define MAX 100

int main(void) {
  int arr[MAX];
  int counter = 0;
  while (scanf("%d,", &arr[counter]) != EOF) {
    counter++;
  }

  for (int i = 0, end = counter / 2; i < end; i++) {
    if (arr[i] != arr[counter - i - 1]) {
      printf("No");
      return 0;
    }
  }

  printf("Yes");

  return 0;
}