#include <bits/stdc++.h>
#define int long long
using namespace std;
int l,n,m,arr[100005],brr[100005],a[100005],b[100005],ans;
signed main(){
	cin>>l>>n>>m;
	for(int i=1;i<=n;i++){
		cin>>arr[i]>>brr[i];
	}
	for(int i=1;i<=m;i++){
		cin>>a[i]>>b[i];
	}
	for(int i=1,j=1;i<=n && j<=m;){
		if(arr[i]==a[j]){
			ans+=min(brr[i],b[j]);
		}
		brr[i]-=min(brr[i],b[j]);
		b[j]-=min(brr[i],b[j]);
		cout<<arr[i]<<" "<<a[j]<<"\n";
		if(brr[i]==0){
			i++;
		}
		if(b[j]==0){
			j++;
		}
	}
	cout<<ans;
}

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OCA0IDMKMSAyCjMgMgoyIDMKMyAxCjEgNAoyIDEKMyAz

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3 2
2 3
3 1
1 4
2 1
3 3