#include <stdio.h>
#include <math.h>

int main(){
   int a[3];
   int b[3];
   unsigned long long int ans = 0;
   for(int i = 0;i < 3;i++){
      scanf("%d %d ",&a[i],&b[i]);
      ans += a[i];
   }
   if(ans % 2 == 0)printf(":-)\n");
   else printf(":-(\n");
}