#include <iostream>
#include <vector>
#include <stack>
#include <algorithm> // sort
using namespace std;
int main() {
int n, start;
cin >> n >> start;
vector<vector<int>> graph(n);
// 각 노드의 인접 노드 입력
for (int i = 0; i < n; i++) {
int x;
while (cin >> x) {
graph[i].push_back(x);
if (cin.peek() == '\n') break;
}
// 인접 노드 정렬 (오름차순)
sort(graph[i].begin(), graph[i].end());
}
vector<bool> visited(n, false);
stack<int> st;
st.push(start);
while (!st.empty()) {
int cur = st.top();
st.pop();
if (visited[cur]) continue;
visited[cur] = true;
cout << cur << " ";
// 큰 번호부터 스택에 넣기
for (int i = (int)graph[cur].size() - 1; i >= 0; i--) {
int next = graph[cur][i];
if (!visited[next]) st.push(next);
}
}
cout << endl;
return 0;
}
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