#include<cstdio>
#include<vector>
#include<algorithm>
template<typename T>void read(T &x){
	x=0;bool f=0;char ch=getchar();
	for(;ch<'0'||ch>'9';ch=getchar())if(ch=='-')f=1;
	for(;ch>='0'&&ch<='9';ch=getchar())x=(x<<1)+(x<<3)+(ch^48);
	if(f)x=-x;
}
void write(char x){putchar(x);}
template<typename T>void write(T x){
	if(x<0)putchar('-'),x=-x;
	char stk[11];int cnt=0;
	do stk[++cnt]=x%10+48,x/=10;while(x);
	for(;cnt;)putchar(stk[cnt--]);
}
template<typename T,typename ...Args>void read(T &x,Args &...args){read(x);read(args...);}
template<typename T,typename ...Args>void write(T x,Args ...args){write(x);write(args...);}
template<typename T>T min(T x,T y){return x<y?x:y;}
template<typename T>T max(T x,T y){return x>y?x:y;}
int a[54],n,siz,ed[104],tot;bool st[104],vis[104],lp[104];char jk[7];
std::vector<std::pair<int,int> >E,R;
bool rd(){
	scanf("%s",jk);
	return jk[1]=='s';
}
signed main(){
	for(int i=1;i<=47;++i)a[i]=48-i;
	read(n);
	for(int i=1;i<=n;++i){
		printf("at 00:00 check %d\n",i);fflush(stdout);
		st[i]=rd();ed[i]=-1;
	}
	int time=0;
	for(int i=1;i<=47;++i){
		time+=a[i];
		for(;siz&&time>=E[0].first;){
			R.emplace_back(E[0]);E.erase(E.begin(),E.begin()+1);siz--;
			for(;siz&&E[0].first==R[0].first;)
				R.emplace_back(E[0]),E.erase(E.begin(),E.begin()+1),siz--;
			int pl=0;
			for(int j=R[0].first;;++j){
				if(j==time){
					for(int k=1;k<=n;++k)if(!vis[k]){
						printf("at %02d:%02d check %d\n",time/60,time%60,k);fflush(stdout);
						if(rd()!=st[k])E.emplace_back(time-a[i]+720,k),siz++,vis[k]=1;
					}
				}
				for(auto[fi,se]:R)if(!lp[se]){
					if(j==1440){ed[se]=st[se]?0:720;lp[se]=1;pl++;continue;}
					printf("at %02d:%02d check %d\n",j/60,j%60,se);fflush(stdout);
					if(rd()==st[se]){
						ed[se]=(j-(!st[se]?720:0)+1440)%1440,tot++;lp[se]=1;pl++;
					}
				}
				if(pl==(int)R.size())break;
			}
			R.clear();
		}
		for(int j=1;j<=n;++j)if(!vis[j]){
			printf("at %02d:%02d check %d\n",time/60,time%60,j);fflush(stdout);
			if(rd()!=st[j])E.emplace_back(time-a[i]+720,j),siz++,vis[j]=1;
		}
	}
	for(;siz;){
		R.emplace_back(E[0]);E.erase(E.begin(),E.begin()+1);siz--;
		for(;siz&&E[0].first==R[0].first;)
			R.emplace_back(E[0]),E.erase(E.begin(),E.begin()+1),siz--;
		int pl=0;
		for(int j=R[0].first;;++j){
			for(auto[fi,se]:R)if(!lp[se]){
				if(j==1440){ed[se]=st[se]?0:720;pl++;lp[se]=1;continue;}
				printf("at %02d:%02d check %d\n",j/60,j%60,se);fflush(stdout);
				if(rd()==st[se]){
					ed[se]=(j-(!st[se]?720:0)+1440)%1440,tot++;lp[se]=1;pl++;
				}
			}
			if(pl==(int)R.size())break;
		}
		R.clear();
	}
	puts("answer");fflush(stdout);
	for(int i=1;i<=n;++i)printf("%02d:%02d\n",ed[i]/60,ed[i]%60),fflush(stdout);
	return 0;
}