include [HTML_REMOVED]
include [HTML_REMOVED]
using namespace std;
const int N = 1010;
double a[N], b[N], c[N];
int main() {
int k = 0, x, count=0;
double v;
cin >> k;
for (int i = 0; i < k; i++) {
cin >> x >> v;
a[x] = v;
}
cin >> k;
for (int i = 0; i < k; i++) {
cin >> x >> v;
b[x] = v;
}
for (int i = 0; i < N; i++) {
c[i] = a[i] + b[i];
}
for (int i = 0; i < N; i++) {
if (c[i])
count++;
}
printf("%d", count);
for (int i = N - 1; i >= 0; i--) {
if (c[i]) {
printf(" %d %.1lf", i, c[i]);
}
}
return 0;
}