csu1018

#include 
using namespace std;
 
int main()
{
    int T,t0 = 0;
    int a,b,c;
    int t1 = 0,t2 = 0,t3 = 0,t4 = 0;
    cin >> T;
    while(t0 < T)
    {
        cin >> a >> b;
        if((a > 0) && (b > 0))
        {
            c = a * b;
            t1 = c % 10;
            t2 = ((c - t1) / 10) % 10;
            t3 = ((c - t1 - t2 * 10) / 100) % 10;
            t4 = ((c - t1 - t2 * 10 - t3 * 100) / 1000) % 10;
            c = t1 + t2 * 10 + t3 * 100 + t4 * 1000;
            if(c >= 1000)
                cout << c << endl;
            else if(c >= 100)
                cout << '0' << c << endl;
            else if(c >= 10)
                cout << '0' << '0' << c << endl;
            else
                cout << '0' << '0' << '0' << c << endl;
        }
        t0 = t0 + 1;
    }
    return 0;
}