1009

#include<iostream>
#include<cstdio>
using namespace std;


double arr[1010] = { 0 };
double ans[2010] = { 0 };


int main_1009(){

int K;
scanf("%d", &K);


int n;
double an;
for (int i = 0; i < K; i++){
scanf("%d%lf", &n, &an);
arr[n] = an;
}


scanf("%d", &K);
for (int i = 0; i < K; i++){
scanf("%d%lf", &n, &an);
for (int j = 0; j < 1001; j++){
if (arr[j] != 0){
ans[j + n] += arr[j] * an;
}
}
}


int num = 0;
for (int i = 2000; i >= 0; i--){
if (ans[i] != 0)
num++;
}
printf("%d", num);


for (int i = 2000; i >= 0; i--){
if (ans[i] != 0)
printf(" %d %.1f", i, ans[i]);

}
return 0;
}