char s[10];
multiset<pii> mp;
 
int main()
{
    //ROP;
    int n;
    while (scanf("%d", &n), n)
    {
        mp.clear();
        printf("Case %d:\n", ++cases);
        for (int i = 0; i < n; i++)
        {
            scanf("%s", s);
            int a, b;
            scanf("%d%d", &a, &b);
            if (s[0] == 'a')
                mp.insert(MP(a, b));
            if (s[0] == 'f')
            {
                mp.insert(MP(a, b));
                multiset<pii>::iterator it = mp.find(MP(a, b)), tmp = it;
                while (it != mp.end())
                {
                    if (it->X > a && it->Y > b) break;
                    else it++;
                }
                if (it != mp.end()) printf("%d %d\n", it->X, it->Y);
                if (it == mp.end()) puts("-1");
                mp.erase(tmp);
            }
            if (s[0] == 'r')
                mp.erase(MP(a, b));
        }
        puts("");
    }
    return 0;
}