#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n,area,i,soma,a;
    float c;
    vector <int> v;
    while (1)
    {
        v.clear();
        soma=0;
        scanf("%d %d",&n,&area);
        if (n==0 && area==0)break;
            for (i=0; i<n; i++)
            {
                scanf("%d",&a);
                v.push_back(a);
            }
            for (i=0;i<n;i++)
                soma+=v[i];
            if (soma==area)
                printf(":D\n");

            else
            {
                if (soma<area)
                    printf("-.-\n");
               // else
                {

                }
            }
    }
    return 0;
}