#include<iostream>

 #include<stdio.h>

 using namespace std;

 int compare(void const * i,void const * j);

 int main()

 {

     //freopen("acm.acm","r",stdin);

     int num;

     int i;

     int j;

     int st;

     int sum;

     int f_num;

     int * a;

     cin>>num;

     j = ;

     while(num --)

     {

         cin>>st;

         cin>>f_num;

         sum = ;

         a = new int[f_num];

         for(i = ; i < f_num; ++ i)

         {

             cin>>a[i];

         }

         qsort(a,f_num,sizeof(int),compare);

         for(i = ; i < f_num; ++ i)

         {

             sum += a[i];

             if(sum >= st)

             {

                 cout<<"Scenario #"<<j<<":"<<endl;

                 cout<<i+<<endl;

                 ++j;

                 cout<<endl;

                 break;

             }

         }

         if(i == f_num)

         {

             cout<<"Scenario #"<<j<<":"<<endl;

             cout<<"impossible"<<endl;

             ++ j;

             cout<<endl;

         }

         delete[] a;

     }

 }

 int compare(void const * i,void const * j)

 {

     return *((int *)j) - *((int *)i);

 }