#include <cstdio>
#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <cstring>
#include <map>
#include <set>
using namespace std;

int n, m, a, dsafe, t1, t2, t3;
int safecnt;
bool danger[10042];
vector< pair<int, int> > edges[10042];

void dfs(int v, int d) {
	if (!danger[v]) {
		//printf("%d is now in danger!\n", v);
		danger[v] = true;
		--safecnt;
	}
	for (vector< pair<int, int> >::iterator it = edges[v].begin(); it != edges[v].end(); ++it) {
		if (d - it->second > 0) {
			dfs(it->first, d - it->second);
		}
	}
}

int main() {
	scanf("%d %d %d %d", &n, &m, &a, &dsafe);
	while (n) {
		for (int i = 0; i < n; ++i) {
			edges[i].clear();
			danger[i] = false;
		}
		safecnt = n;
		for (int i = 0; i < m; ++i) {
			scanf("%d %d %d", &t1, &t2, &t3);
			--t1; --t2;
			edges[t1].push_back(make_pair(t2, t3));
			edges[t2].push_back(make_pair(t1, t3));
		}
		for (int i = 0; i < a; ++i) {
			scanf("%d", &t1);
			--t1;
			dfs(t1, dsafe);
			printf("%d\n", safecnt);
		}
		printf("\n");
		scanf("%d %d %d %d", &n, &m, &a, &dsafe);
	}
}