#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    if(n == m) {
        cout << n + m - 2 << "\n";
        for(int i = 1; i <= n - 1; i++) cout << "1 " << i << "\n" << m << " " << i << "\n";
        return 0;
    }
    bool swapped = false;
    if(n > m) {
        swap(n, m);
        swapped = true;
    }
    if(n % 2 == 1) {
        vector<pair<int, int>> res;
        for(int i = 1; i <= n; i++) res.push_back({i, 1});
        for(int i = 1; i <= n; i++) res.push_back({i, m});
        int start = (n + 1) / 2 + 1, finish = m - (n + 1) / 2;
        for(int i = start; i <= finish; i++) res.push_back({(n + 1) / 2, i});
        if(swapped) {
            for(int i = 0; i < res.size(); i++) {
                swap(res[i].first, res[i].second);
            }
        }
        cout << res.size() << "\n";
        for(int i = 0; i < res.size(); i++) cout << res[i].first << " " << res[i].second << "\n";
        return 0;
    }
    vector<pair<int, int>> res;
    for(int i = 1; i <= n; i++) res.push_back({i, 1});
    for(int i = 1; i <= n; i++) res.push_back({i, m});
    int start = n / 2 + 2, finish = m - n / 2 - 1;
    for(int i = start; i <= finish; i += 2) {
        res.push_back({n / 2, i});
        res.push_back({n / 2 + 1, i});
    }
    if(swapped) {
        for(int i = 0; i < res.size(); i++) {
            swap(res[i].first, res[i].second);
        }
    }
    cout << res.size() << "\n";
    for(int i = 0; i < res.size(); i++) cout << res[i].first << " " << res[i].second << "\n";
    return 0;
}