#include<stdio.h>
#include<stdlib.h>
int main(){
    int a[100], n = 0, i;
    char ch;
    while(1){
        if(scanf("%d", &a[n]) != 1){
            print("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;
}