#include <bits/stdc++.h>
using namespace std;
template <typename T> inline void read(T &x){x=0;int f=1;char c=getchar();while(c<'0'||c>'9'){if(c=='-')f*=-1;c=getchar();}while(c>='0'&&c<='9')x=(x<<1)+(x<<3)+(c^48),c=getchar();x*=f;}
template <typename T> inline void write(T x){if(x>9)write(x/10);putchar(x%10+'0');}
const int N=110,DAY=1440,HALF=720;
char ask(int time,int who){
	cout<<"at "<<setw(2)<<setfill('0')<<time/60<<":"<<setw(2)<<setfill('0')<<time%60<<" check "<<who+1<<endl;//补全位数
	string tmp;
	cin>>tmp;
	return tmp[1];
}
struct sleep{char init;int l=-1,r=-1,ans=-1;}slp[N];
int n;
int main(){
	read(n);
    for(int i=0;i<n;i++)slp[i].init=ask(0,i);
    for(int l=0,r=49;l<HALF;tie(l,r)=make_pair(r,min(r+r-l-1,HALF)))
        for(int i=0;i<n;i++)
            if(slp[i].l==-1){
                char tmp=ask(r,i);
                if(tmp!=slp[i].init)slp[i].l=HALF+l+1,slp[i].r=HALF+r-1;
            }
    for(int time=HALF;time<DAY;time++)
        for(int i=0;i<n;i++)
            if(slp[i].l<=time&&time<=slp[i].r&&slp[i].ans==-1){
                char tmp=ask(time,i);
                if(tmp==slp[i].init)slp[i].ans=time;
            }
    printf("answer\n");
    for(int i=0;i<n;i++){
        if(slp[i].ans==-1)slp[i].ans=slp[i].r+1;
        int time=slp[i].ans-HALF*(slp[i].init=='w');
		time%=DAY,cout<<setw(2)<<setfill('0')<<time/60<<":"<<setw(2)<<setfill('0')<<time%60<<"\n";
    }
    return 0;
}