//蒟蒻
//#pragma GCC optimize(2)
#include<bits/stdc++.h>
using namespace std;
const int N = 10010;
int n, q, a, b, father[N][25], dep[N];
vector<int> g[N]; //邻接链表

void dfs (int u) { // 统计深度 
	if( father [u][0] == 0 ) dep[u] = 1;
	else dep[u] = dep[father[u][0]] + 1;	
	for (int i = 0; i < g[u].size(); i++) {
		int v = g[u][i];
		if ( v != father[u][0] ) dfs(v); //不走回头路 
	}
	
}
int LCA(int x, int y){
	//调平?
  	if(dep[x] < dep[y]) swap(x, y);
	for(int i = 15; i >= 0; i--){
    	if(dep[father[x][i]] >= dep[y]) x = father[x][i];
		if(x == y) return x;   
		// 一起上浮
		for(int i = 15; i >= 0; i--){
			if(father[x][i] != father[y][i]){
            	x = father[x][i];
           		y = father[y][i];
        	}
        }
    }  
	// 再向上一步
   	return father[x][0];
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	
	scanf ( "%d", &n );
	for (int i = 1; i < n; i++) {
		scanf ( "%d %d", &a, &b );
		g[a].push_back(b);
		father[b][0] = a;
	}
	
	//找一下根
	int root; 
	for(int i = 1; i<= n; i++) {
		if(father[i][0] == 0) {
			root = i;
			break;		
		}
	}
	dfs(root);
	
	//处理st表
	
	for (int j = 1; (1 << j) <= n; j++) {
		for (int i = 1; i <= n; i++) { // 枚举起点 
			father [i][j] = father[father[i][j-1]][j-1];  
		}
	} 
	scanf("%d", &q);
	while(q--){
        scanf("%d %d", &a, &b);
		printf("%d\n",LCA(a, b));
    }
	return 0;
}

你进我的世界