#include <iostream>
using namespace std;
int main()
{
int a[3],b[3];
for (int i = 0;i<3;i++)
{cin>>a[i]>>b[i];
}
cout<<a[0]-a[2]<<b[0]-b[1];
return 0;
}

You forgot the space.

Where am I must write the space? Only in output?

between ans1 << " " << ans2;