// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
using namespace std;

int n;
int ans[1500];
int bed[1500];

string get(int time, int dwarf){
	if((time+1440-bed[dwarf])%1440 < 720){
		return "asleep";
	}
	return "awake";
}

bool ask(int time, int dwarf){
	int hour = time/60;
	int minute = time%60;
	string e;
	cout << ((hour < 10) ? "at 0" : "at ") << hour << ((minute < 10) ? ":0" : ":") << minute << " check " << dwarf << endl;
	//e = get(time,dwarf);
	cin >> e;
	//cout << e << endl;
	if(e == "awake"){
		return 1;
	}
	return 0;
}

void solve(){
	int time = 0;
	int interval = 40;
	vector<int> state[n+1];
	bool flag[n+1];
	vector<pair<int,int>> do_shit;
	memset(flag,0,sizeof(flag));
	while(interval){
		for(int j = 1;j <= n;j++){
			if(flag[j]){
				continue;
			}
			state[j].push_back(ask(time,j));
			if(state[j].size() > 1){
				if(state[j].back() != state[j][state[j].size()-2]){
					flag[j] = true;
					for(int i = time-interval;i <= time;i++){
						//cout << "I=" << i << endl;
						do_shit.push_back({(i+720)%1440,j});
						if(do_shit.back().first == 0){
							do_shit.back().first = 1440;
						}else if(do_shit.back().first < 10){
							do_shit.pop_back();
						}
					}
				}
			}
		}
		time = min(720,time+interval);
		interval--;
	}
	sort(do_shit.begin(),do_shit.end());
	for(auto [i,j] : do_shit){
		if(ans[j] != -1){
			continue;
		}
		if(i == 1440){
			ans[j] = 720*(state[j].back()^1);
			continue;
		}
		if(ask(i,j) != state[j].back()){
			if(state[j].back() == 0){
				ans[j] = (i+720)%1440;
			}else{
				ans[j] = i;
			}
		}
	}
}

int main() {
	cin >> n;
	memset(ans,-1,sizeof(ans));
	// for(int i = 1;i <= n;i++){
	// 	cin >> bed[i];
	// }
	solve();
	cout << "answer" << endl;
	for(int i = 1;i <= n;i++){
		int hour = ans[i]/60;
		int minute = ans[i]%60;
		assert(ans[i] != 1440);
		cout << ((hour < 10) ? "0" : "") << hour << ((minute < 10) ? ":0" : ":") << minute << endl;
	}
}