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

#define ll long long
#define nl "\n"

void files(){
    ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL);
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
    #endif
}


void solve(){

    int n; cin>>n;
    int s; cin>>s;
    vector<bool> vis(n+1, false);
    queue<int> q;
    vis[s] = true;
    int k; cin>>k;
    for(int i = 0; i < k; i++){
        int x; cin>>x;
    }

    q.push(s);
    vis[s] = true;

        while(!q.empty()){
            int x = q.front();
            q.pop();
            cout<<"> "<<x<<endl;
            cout.flush();
            cin>>k;
            if(k <= 0) return;
            for(int i = 0; i < k; i++){
                int y; cin>>y;
                if(!vis[y]){
                    vis[y] = true;
                    q.push(y);
                }
            }
        }



}

int main(){
    files();
    int t = 1;
    // cin>>t;
    while(t--) solve();

    return 0;
}