#include<bits/stdc++.h>
#include<queue> 
using namespace std;
int main(){
	int m,n,k;
	cin>>m>>n>>k;
	queue<int>man;
	queue<int>woman;
	for(int i=1;i<=m;i++){
		man.push(i);
	}
	for(int i=1;i<=n;i++){
		woman.push(i);
	}
	for(int i=1;i<=k;i++){
		int a=man.front();
		int b=woman.front();
		man.pop();
		woman.pop();
		cout<<a<<" "<<b<<endl;
		man.push(a);
		woman.push(b); 
	}
}