// 2014/06/16 Tazoe

#include <iostream>
using namespace std;

const int INF = 1000000000;

int main()
{
	while(true){
		int n, m;
		cin >> n >> m;

		if(n==0 && m==0)
			break;

		int C[100][100];
		int T[100][100];
		for(int i=0; i<m; i++){
			for(int j=0; j<m; j++){
				if(i==j){
					C[i][j] = T[i][j] = 0;
				}
				else{
					C[i][j] = T[i][j] = INF;
				}
			}
		}

		for(int i=0; i<n; i++){
			int a, b, c, t;
			cin >> a >> b >> c >> t;

			C[a-1][b-1] = C[b-1][a-1] = c;
			T[a-1][b-1] = T[b-1][a-1] = t;
		}
    for(int i=0;i<m;i++){
      for(int j=0;j<m;j++){
        for(int k=0;k<m;k++){
          if(C[i][j] > C[i][k]+C[k][j])
            C[i][j] = C[i][k] + C[k][j];
          if(T[i][j] > T[i][k]+T[k][j])
            T[i][j] = T[i][k] + T[k][j];
        }
      }
    }
    unsigned int k;
    for(int i=0;i<k;i++){
      int p,q,r;
      cin >> p >> q;
      if(k == 0  &&  q == 0)
        return 0;
      cin >> r;
      
      if(r==0){
        cout << C[p][q] << endl;
      } else {
        cout << T[p][q] << endl;
      }
    }

	}

	return 0;
}
