#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
    int n;
    scanf("%d", &n);
    while (n -- )
    {
        int a;
        char c;
        cin >> a >> c;
        while (a -- )
        {
            cout << c;
        }
        puts("");
    }
    return 0;
}