#include <bits/stdc++.h>

#define fi first
#define se second
#define pb push_back

typedef long long ll;
#define int ll

using namespace std;

main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n, m;
    cin>>n>>m;

    vector<pair<int, int> > pos;
    if (n==1 || m==1)
    {
        for (int i=1; i<=n; i++)
            for (int j=1; j<=m; j++)
                pos.pb({i, j});
    }
    else if (n==2)
    {
        for (int i=1; i<=m; i++)
            if (i%2==1)
                pos.pb({1, i}), pos.pb({2, i});
    }
    else if (m==2)
    {
        for (int i=1; i<=n; i++)
            if (i%2==1)
                pos.pb({i, 1}), pos.pb({i, 2});
    }
    else if (n==m)
    {
        for (int i=1; i<=n; i++)
        {
            pos.pb({1, i});
            if (i > 1 && i < n)
                pos.pb({n, i});
        }
    }
    else
    {
        bool sw = false;
        if (n > m)
            swap(n, m), sw = true;
        int x = (n+1)/2;

        for (int i=1; i<=n; i++)
        {
            pos.pb({i, 1});
            pos.pb({i, m});
        }
        for (int i=1; i<=m; i++)
        {
            if (m-n <= i-x)
                break;
            if (x+i > n+1)
                pos.pb({x, i});
        }

        if (sw)
            for (auto& pa : pos)
                swap(pa.fi, pa.se);
    }

    cout<<pos.size()<<"\n";
    for (auto [x, y] : pos)
        cout<<x<<" "<<y<<"\n";
}

/*
5 5
8
1 1
1 2
5 2
1 3
5 3
1 4
5 4
1 5

2 5
5
1 1
1 5
2 1
2 5
1 3

6 7
12
1 1
1 7
2 1
2 7
3 1
3 7
4 1
4 7
5 1
5 7
6 1
6 7

4 5
8
1 1
1 5
2 1
2 5
3 1
3 5
4 1
4 5

4 6
8
1 1
1 6
2 1
2 6
3 1
3 6
4 1
4 6

4 7
9
1 1
1 7
2 1
2 7
3 1
3 7
4 1
4 7
2 4
*/