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

using ll = long long;
//#define int ll
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
using pii = pair<int, int>;
using vi = vector<int>;
#define fi first
#define se second
#define pb push_back

char ask(int time,int who)
{
    cout<<"at "<<setw(2)<<setfill('0')<<time/60<<":"<<setw(2)<<setfill('0')<<time%60<<" check "<<who+1<<endl;
    string resp;
    cin>>resp;
    return resp[1];
}

const int DAY=24*60,HALF=DAY/2;

struct Dwarf
{
    char init;
    int l=-1,r=-1;
    int ans=-1;
};

signed main() {
    cin.tie(0)->sync_with_stdio(0);
    cin.exceptions(cin.failbit);

    int n;
    cin>>n;
    Dwarf dwarf[n];
    for(int i=0;i<n;i++)
        dwarf[i].init=ask(0,i);
    for(int l=0,r=49;l<HALF;tie(l,r)=pair(r,min(r+r-l-1,HALF)))
    {
        for(int i=0;i<n;i++)
            if(dwarf[i].l==-1)
            {
                char resp=ask(r,i);
                if(resp!=dwarf[i].init)
                    dwarf[i].l=HALF+l+1,
                    dwarf[i].r=HALF+r-1;
            }
    }
    for(int time=HALF;time<DAY;time++)
        for(int i=0;i<n;i++)
            if(dwarf[i].l<=time&&time<=dwarf[i].r&&dwarf[i].ans==-1)
            {
                char resp=ask(time,i);
                if(resp==dwarf[i].init)
                    dwarf[i].ans=time;
            }
    cout<<"answer\n";
    for(int i=0;i<n;i++)
    {
        if(dwarf[i].ans==-1)
            dwarf[i].ans=dwarf[i].r+1;
        int time=dwarf[i].ans-HALF*(dwarf[i].init=='w');
        time%=DAY;
        cout<<setw(2)<<setfill('0')<<time/60<<":"<<setw(2)<<setfill('0')<<time%60<<"\n";
    }
}