#include<bits/stdc++.h>
using namespace std;
int main()
{
    int t;
    cin>>t;
    int a,b,sum,i,j;
    while(t--)
    {
        cin>>a>>b>>sum;
        int x[a],y[b];
        for(i=0;i<a;i++) cin>>x[i];
        for(i=0;i<b;i++) cin>>y[i];
        sort(x,x+a);
        sort(y,y+b);
        int count=0,c=0,d=1;
        for(i=0;i<a;i++)
        {
            for(j=0;j<b;j++)
            {
                if((x[i]+y[j])== sum)
                {
                    count++;
                    if(count>1)
                    {
                        cout<<", ";
                    }
                    cout<<x[i]<<" "<<y[j];
                }
            }
        }
        if(count==0) cout<<-1<<endl;
        cout<<endl;
    }
}