#include <stdio.h>

int main(void){
	int A[10],c,i;
	for (i=0;i<10;i++){
		scanf("%d",&A[i]);
	}
	for (i=0;i<10;i++){
		if (A[i]>=0 && A[i]%2==0){
			printf("%d",A[i]);
		}
		if (i==9){
			break;
		}
		if (A[i]<0 && A[i+1]>=0){
			printf("%d",A[i]);
		}
	}
	return 0;
}