// listに書き直す
#include <iostream>

struct Node {
	int key;
	Node* next;
	Node* prev;
};

class Splice {
public:
	Node* first;
	Node* end;
	int size;
	Splice() {
		size = 0;
		first = new Node;
		end = new Node;
		first->next = end;
		first->prev = nullptr;
		end->next = nullptr;
		end->prev = first;
	}
	void insert(int x) {
		size++;
		Node* n = new Node;
		n->key = x;
		n->next = end;
		n->prev = end->prev;
		end->prev->next = n;
		end->prev = n;
	}
	void dump() {
		Node* tmp = first;
		for (int i = 0; i < size; i++) {
			tmp = tmp->next;
			std::cout << tmp->key;
			if (i < size - 1) {
				std::cout << " ";
			}
		}
		std::cout << std::endl;
	}
	void splice(Splice& s) {
		end->prev->next = s.first->next;
		end->prev->next->prev = end->prev;
		end = s.end;
		size += s.size;

		s.size = 0;
		s.first = new Node;
		s.end = new Node;
		s.first->next = s.end;
		s.end->prev = s.first;
	}
};

int main() {
	int n, q;
	std::cin >> n >> q;
	Splice* s = new Splice[n];
	while (q--) {
		int com, t;
		std::cin >> com >> t;
		if (com == 0) {
			int x;
			std::cin >> x;
			s[t].insert(x);
		}
		if (com == 1) {
			s[t].dump();
		}
		if (com == 2) {
			int t1;
			std::cin >> t1;
			s[t1].splice(s[t]);
			//s[t1].dump();
		}
	}
}


