#include <bits/stdc++.h>

using namespace std;

using ldb = long double;
using ll = long long;

using vi = vector<int>;

string to(int time){
    string hour = to_string(time / 60),mini = to_string(time % 60);
    if (hour.size() == 1){
        hour = "0" + hour;
    }
    if (mini.size() == 1){
        mini = "0" + mini;
    }
    string ans = hour + ":" + mini;
    return ans;
}

void query(int time,int idx){
    cout << "at " << to(time) << " check " << idx << endl; 
}

int get(){
    string s;
    cin >> s;
    if (s == "asleep") return 0;
    return 1;
}

int main() {
    int n;
    cin >> n;

    set<array<int,5>> evt; // time idx typ lst lstanstyp
    vector<string> ans(n + 1,"FUCK");
    vector<int> rst(n + 1,50);
    vector<int> tz(n + 1);
    int all = 24 * 60;

    for (int i = 1;i <= n;i++){
        query(0,i);
        int op = get();
        rst[i]--;
        evt.insert({47,i,op,46,-1});
    }
    while (!evt.empty()){
        auto [time,idx,typ,lst,stage] = *evt.begin();
        evt.erase(evt.begin());
        if (ans[idx] != "FUCK") continue;
        rst[idx]--;
        query(time,idx);
        int res =  get();
        // cout << time << " " << res << " " << typ << " " << stage << "\n";
        
        if (stage == -1){
            if ((res ^ 1) == typ){
                tz[idx] = typ;
                int l = (time + 720 - (lst + 1)) % all;
                // cout << ":";
                for (int r = l;rst[idx] && r < all;r++,rst[idx]--){
                    evt.insert({r,idx,typ,-1,res});
                    // cout << r << " ";
                }
                // cout << "\n";
            }else{
                if (lst != -1)
                time += lst;
                lst--;
                evt.insert({time,idx,typ,lst,-1});
            }
        }else{
            if ((res ^ 1) == stage){
                // cout << time << "\n";
                if (res == 0){
                    ans[idx] = to(time);
                }else{
                    ans[idx] = to((time - all / 2 + all) % all);
                }
            }
        }
    }



    cout << "answer" << endl;

    for (int i = 1;i <= n;i++){
        if (ans[i] == "FUCK"){ 
            if (!tz[i])
                ans[i] = "00:00";
            else
                ans[i] = "12:00";
        }
        cout << ans[i] << endl;
    }


    return 0;
}