#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<climits>
#include<algorithm>
using namespace std;
#define MAXN 10010
int pre1[MAXN], pre2[MAXN]; 
int num1, num2;
struct graph 
{
    int son;
    bool ring;
};
graph g1[MAXN], g2[MAXN];
bool cmb(const graph &g1, const graph &g2) 
{
    if(g1.son < g2.son)
        return true;
    else if(g1.son == g2.son && g1.ring < g2.ring)
        return true;
    else
        return false;
}
int find(int x, int pre[]) 
{
    return x == pre[x] ? x : find(pre[x], pre);
}
void join(int x, int y, int pre[],graph g1[]) 
{
    int root1, root2;
    root1 = find(x, pre);
    root2 = find(y, pre);
    if(root1 == root2)
        g1[root1].ring = true; 
    else
    {
        if(g1[root1].son >= g1[root2].son)
        {
            pre[root2] = root1;
            g1[root1].son += g1[root2].son;
        }
        else
        {
            pre[root1] = root2;
            g1[root2].son += g1[root1].son;
        }
    }
}
bool cmp(int num, graph g1[], graph g2[]) 
{
    sort(g1 + 1, g1 + num + 1, cmb); 
    sort(g2 + 1, g2 + num + 1, cmb);
    for(int i = 1; i <= num; ++i)
        if(g1[i].son != g2[i].son || (g1[i].son == g2[i].son && g1[i].ring != g2[i].ring))
            return false;
    return true;
}
int main()
{
    int ncase, T = 0;
    int link1, link2;
    int hand1, hand2;
    int ans1, ans2;
    bool flag;
    scanf("%d", &ncase);
    while(ncase--)
    {
        flag = true;
        scanf("%d%d", &num1, &link1);
        for(int i = 1; i < MAXN; ++i)
        {
            pre1[i] = i;
            pre2[i] = i;
            g1[i].son = 1;
            g2[i].son = 1;
            g1[i].ring = false;
            g2[i].ring = false;
        }
        for(int i = 1; i <= link1; ++i)
        {
            scanf("%d%d", &hand1, &hand2);
            join(hand1, hand2, pre1, g1);
        }
        scanf("%d%d", &num2, &link2);
        if(link2 != link1) 
            flag = false;
        for(int i = 1; i <= link2; ++i)
        {
            scanf("%d%d", &hand1, &hand2);
            if(flag == false)
                continue;
            else
                join(hand1, hand2, pre2, g2);
        }
        flag = cmp(num2, g1, g2);
        if(flag == false)
            printf("Case #%d: NO\n", ++T);
        else
        {
            if(flag)
                printf("Case #%d: YES\n", ++T);
            else
                printf("Case #%d: NO\n", ++T);
        }
    }
    return 0;
}