include <bits/stdc++.h>

using namespace std; queuea; queueb; int main() {

int n,m,k;
cin>>n>>m>>k;
for(int i=1;i<=n;i++)a.push(i);
for(int i=1;i<=m;i++)b.push(i);
for(int i=1;i<=k;i++){
	cout<<a.front()<<" "<<b.front()<<endl;
	a.push(a.front());
	b.push(b.front());
	a.pop();
	b.pop();
}
return 0;

}