include <bits/stdc++.h>

using namespace std; int main() { int n; cin>>n; for(int i=1; i<=n; i++) { if(i%2==1) for(int j=1; j<=n;j++) { if(j%2==1) cout<<"*"; else cout<<" "; } else for(int j=1; j<=n; j++) { if(j%2==1) cout<<" "; else cout<<"*"; } cout<<endl; } }