#include <cstdio>
#include <cmath>
#define rep(i,n,m) for(int i=(n); i < (m); i++)

typedef long long int ll;

int main(void){
    ll sum = 0;
    rep(i,0,3){
        ll a,b;
        if (!scanf("%d %d", &a, &b))
            return 0;
        sum+=std::pow(a,b);
    }
    if (sum%2 == 0){
        printf(":-)\n");
    }
    else{
        printf(":-(\n");
    }
    return 0;
}