#include <bits/stdc++.h>

using namespace std;

int main()
{
    long long n,m;
    cin>>n>>m;
    if (n==m)
    {
        cout<<n+m-2<<endl;
        for (long long i=1;i<=n;i++) cout<<1<<" "<<i<<endl;
        for (long long i=2;i<=n-1;i++) cout<<n<<" "<<i<<endl;
        return 0;
    }
    if (n<m)
    {
        if (n%2==1)
        {
            cout<<n+m-1<<endl;
            for (long long i=1;i<=n;i++) cout<<i<<" "<<1<<endl;
            for (long long i=1;i<=n;i++) cout<<i<<" "<<m<<endl;
            long long sredina=(n+1)/2;
            for (long long i=sredina+1;i<=m-sredina;i++) cout<<sredina<<" "<<i<<endl;
            return 0;
        }
        if (m%2==1)
        {
            cout<<n+m-1<<endl;
            for (long long i=1;i<=n;i++) cout<<i<<" "<<1<<endl;
            for (long long i=1;i<=n;i++) cout<<i<<" "<<m<<endl;
            long long sredina1=n/2;
            long long sredina2=sredina1+1;
            for (long long i=sredina2;i<=m-sredina2;i+=2) cout<<sredina1<<" "<<i<<endl;
            for (long long i=sredina2;i<=m-sredina2;i+=2) cout<<sredina2<<" "<<i<<endl;
        }
        else
        {
            cout<<n+m-2<<endl;m--;
            for (long long i=1;i<=n;i++) cout<<i<<" "<<1<<endl;
            for (long long i=1;i<=n;i++) cout<<i<<" "<<m<<endl;
            long long sredina1=n/2;
            long long sredina2=sredina1+1;
            for (long long i=sredina2;i<=m-sredina2;i+=2) cout<<sredina1<<" "<<i<<endl;
            for (long long i=sredina2;i<=m-sredina2;i+=2) cout<<sredina2<<" "<<i<<endl;
        }
    }
    else
    {
        if (m%2==1)
        {
            cout<<n+m-1<<endl;
            for (long long i=1;i<=m;i++) cout<<1<<" "<<i<<endl;
            for (long long i=1;i<=m;i++) cout<<n<<" "<<i<<endl;
            long long sredina=(m+1)/2;
            for (long long i=sredina+1;i<=n-sredina;i++) cout<<i<<" "<<sredina<<endl;
            return 0;
        }
        if (n%2==1)
        {
            cout<<n+m-1<<endl;
            for (long long i=1;i<=m;i++) cout<<1<<" "<<i<<endl;
            for (long long i=1;i<=m;i++) cout<<n<<" "<<i<<endl;
            long long sredina1=m/2;
            long long sredina2=sredina1+1;
            for (long long i=sredina2;i<=n-sredina2;i+=2) cout<<i<<" "<<sredina1<<endl;
            for (long long i=sredina2;i<=n-sredina2;i+=2) cout<<i<<" "<<sredina2<<endl;
        }
        else
        {
            cout<<n+m-2<<endl;n--;
            for (long long i=1;i<=m;i++) cout<<1<<" "<<i<<endl;
            for (long long i=1;i<=m;i++) cout<<n<<" "<<i<<endl;
            long long sredina1=m/2;
            long long sredina2=sredina1+1;
            for (long long i=sredina2;i<=n-sredina2;i+=2) cout<<i<<" "<<sredina1<<endl;
            for (long long i=sredina2;i<=n-sredina2;i+=2) cout<<i<<" "<<sredina2<<endl;
        }
    }
    return 0;
}