#include<stdio.h>
#include<stdlib.h>
int main() {
    inta[100], n = 0; i;
    char ch;
    while (1) {
        if (scanf("%d", &a[n]) != 1) {
            printf("Invalid input");
            return 0;
        }
        if (a[n] == -1)
             break;
        n++;
    }
    for (i = 0; i < n / 2; i++) {
        if (a[i] != a[n - i - 1]) {
            printf("No");
            return 0;
        }
    }
    printf("Yes");
    return 0;
}