#include <bits/stdc++.h>
#define x first
#define y second
using namespace std;
using ll=long long;
using pii=pair<int,int>;
using vi=vector<int>;
using vl=vector<ll>;
#define pb push_back
#define all(a) begin(a),end(a)

const int N=300010,MOD=1e9+7;
const char en='\n';
const ll LLINF=1ll<<60;

int n,m;
bool sw;

vector<pii> solve(int n,int m)
{
	vector<pii> v;
	if (n==m)
	{
		if (n==1) return {{1,1}};
		for (int i=1;i<n;++i) v.pb({i,1}),v.pb({i,m});
		return v;
	}
	if (n%2==1)
	{
		for (int i=1;i<=n;++i) v.pb({i,1}),v.pb({i,m});
		int po=(n+1)/2;
		for (int i=1;i<=m;++i) if (i>po && i<=m-po) v.pb({po,i});
		return v;
	}
	if (m%2==1)
	{
		if (m>2*n)
		{
			for (int i=1;i<=n;++i) v.pb({i,m});
			vector<pii> os=solve(n,m-n);
			for (auto x: os) v.pb(x);
			return v;
		}
		for (int i=1;i<=n;++i) v.pb({i,1}),v.pb({i,m});
		int po=(m+1)/2;
		for (int i=1;i<=n;++i)
		{
			if (i+po>1+n && i<po) v.pb({i,po});
		}
		return v;
	}
	for (int i=1;i<=n;++i) v.pb({i,1}),v.pb({i,m});
	int po=n/2+1;
	for (int i=1;i<=m;++i) if (i>po && i<=m-po) v.pb({po,i});
	return v;
}

//XYYYYYYYYX
//XYYYYYYYYX
//XYYYOOYYYX
//XYYYOOYYYX
//XYYYYYYYYX
//XYYYYYYYYX

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin>>n>>m;
	if (n>m)
	{
		swap(n,m);
		sw=1;
	}
	vector<pii> an=solve(n,m);
	cout<<an.size()<<en;
	for (auto x: an) if (sw) cout<<x.y<<' '<<x.x<<en;
	else cout<<x.x<<' '<<x.y<<en;
}