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