#include <bits/stdc++.h>
using namespace std;
int n,cur=0;
int a0,a1;
int main()
{
    cin>>n;
    while(cin>>a0&&cin>>a1)
    {
        for(int i=1;i<=a0;i++)
        {
            cout<<"0";
            cur++;
            if(cur%n==0)
            {
                cout<<"\n";
            }
        }
        for(int i=1;i<=a1;i++)
        {
            cout<<"1";
            cur++;
            if(cur%n==0)
            {
                cout<<"\n";
            }
        }
    }
    return 0;
}