#include<bits/stdc++.h>

using namespace std;

#define int long long

int memory[101][1450];

bool ask(int id, int t) {
    t %= 1440;
    if (memory[id][t] != -1) return memory[id][t];
    int h = t / 60;
    string hh = to_string(h);
    if (hh.size() == 1) hh = "0" + hh;
    int m = t % 60;
    string mm = to_string(m);
    if (mm.size() == 1) mm = "0" + mm;
    cout << "at " << hh << ":" << mm << " check " << id << endl;
    string s;
    cin >> s;
    return memory[id][t] = (s[1] == 's');
}


int n;
vector<pair<int, int>> ans;
void solve() {
    vector<bool> state(n + 1);
    vector<bool> vis(n + 1);
    for (int i = 1; i <= n; i++) {
        state[i] = ask(i, 0);
    }
    set<pair<int, int>> s;
    for (int t = 39, l = 38; t < 720; t += l, l--) {
        vector<bool> flag(n + 1);
        for (int i = 1; i <= n; i++) {
            if (vis[i]) continue;
            flag[i] = ask(i, t);
            if (flag[i] != state[i]) { 
                for (int j = 0; j <= l; j++) {
                    s.insert({t - l + 720 + j, i});
                }
                vis[i] = true;
            }
            else if (t + l > 720) {
                for (int j = 0; j < l; j++) {
                    s.insert({t + 1 + 720 + j, i});
                }
                vis[i] = true;
            }
        }
    }

    for (auto v : s) {
        auto [tt, id] = v;
        if (vis[id] && state[id] == ask(id, tt)) {
            vis[id] = false;
            if (state[id]) {
                ans.push_back({id, (tt) % 1440});
            }
            else ans.push_back({id, (tt - 720) % 1440});
        }
    }

}

signed main() {
    memset(memory, -1, sizeof memory);
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> n;

    solve();

    cout << "answer" << endl;

    assert(ans.size() == n);
    sort(ans.begin(), ans.end());
    for (int i = 0; i < n; i++) {
        int h = ans[i].second / 60;
        string hh = to_string(h);
        if (hh.size() == 1) hh = "0" + hh;
        int m = ans[i].second % 60;
        string mm = to_string(m);
        if (mm.size() == 1) mm = "0" + mm;

        cout << hh + ":" + mm << endl;
    }

    return 0;
}