#include <bits/stdc++.h>

using namespace std;

int n, m, a;

int main()
{
	freopen("sticks.in", "r", stdin);
	freopen("sticks.out", "w", stdout);
	scanf("%d%d", &n, &m);
	for(int i = 0; i < n; i++)scanf("%d", &a);
	for(int i = 0; i < n; i++)scanf("%d", &a);
	
	printf("%d\n", n);
	for(int i = 0; i < n; i++)printf("1 %d\n", i + 1);
	return 0;
}