//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <chrono>
#include <complex>
#include <cstdio>
#include <cstring>
#include <deque>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <vector>
using namespace std;
#define sz(x) (int) (x).size()
#define i64 int64_t
#define all(x) (x).begin(), (x).end()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int mxn = 101;

int start[mxn], stop[mxn];
int asl[mxn];
int ans[mxn];

string convert(int k) {
	k %= 1440;
	int hr = k/60;
	int mn = k-hr*60;
	string s;
	if (hr<10) {
		s="0"+to_string(hr);
	} else {
		s=to_string(hr);
	}
	s += ":";
	if (mn<10) {
		s += "0"+to_string(mn);
	} else {
		s += to_string(mn);
	}
	return s;
}

int check(int a, int t) {
	cout<<"at "<<convert(t)<<" check "<<a<<endl;
	string s; cin >> s;
//	cout << s << " " << (s[1]=='s')<<endl;
	return (s[1]=='s');
}

signed main() {
    ios::sync_with_stdio(false); cin.tie(nullptr);
    
    memset(start,-1,sizeof(start));
	memset(stop,-1,sizeof(stop));
    memset(asl,-1,sizeof(asl));
    
    int n; cin>>n;
	
	//check 0
	for (int i=1; i<=n; i++) {
		asl[i] = check(i, 0);
	}
	//check 1...730
	int ct=45; int pt=0;
	for (int t=ct; t<=720; t=min(720,t+ct)) {
		for (int i=1; i<=n; i++) {
			if (start[i]==-1) {
				int v = check(i,t);
				if (v != asl[i]) {
					start[i] = pt+719;
					stop[i] = t+721;
				}
			}
		}
		ct--; pt=t;
		if (t==720) break;
	}
	
	for (int t=720; t<1440; t++) {
		for (int i=1; i<=n; i++) {
			if (start[i] <= t && t <= stop[i]) {
				int v = check(i,t);
				if (v == asl[i]) {
					ans[i] = t;
					if (v==0) ans[i] += 720;
					start[i] = 1e9;
				}
			}
		}
	}
	
	cout<<"answer"<<endl;
	for (int i=1; i<=n; i++) {
		ans[i] %= 1440;
		if (ans[i]==0 && !asl[i]) ans[i] += 720;
		cout<<convert(ans[i])<<endl;
	}
	
    return 0;
}