#include<bits/stdc++.h>
using namespace std;
int n,m,vis[4][105000],cnt;
//f[0][i]:(1,i)
//f[1][i]:(n,i)
//f[2][1<i<n]:(i,1)
//f[3][1<i<n]:(i,m)
void solve(int x,int y,int op) {//op: choose or not
    int tmpx=0,tmpy=0,ax=0,ay=0,bx=0,by=0,cx=0,cy=0,dx=0,dy=0;
    if (x==1) {
        tmpx=0;tmpy=y;
    } else if (x==n) {
        tmpx=1;tmpy=y;
    } else if (y==1) {
        tmpx=2;tmpy=x;
    } else {
        tmpx=3;tmpy=x;
    }
    if (vis[tmpx][tmpy]) return;
    vis[tmpx][tmpy]=op+1;
    if (op) cnt++;
    //a:(x,y) (n,y+n-x) (x+m-y,m)
    //b:(x,y) (n,y-n+x) (x+y-1,1)
    //c:(x,y) (1,y+1-x) (x+1-y,1)
    //d:(x,y) (1,y+x-1) (x-m+y,m)
    if (x+m-y<=n) {
        ax=x+m-y;ay=m;
    } else {
        ax=n;ay=y+n-x;
    }
    if (x+y-1<=n) {
        bx=x+y-1;by=1;
    } else {
        bx=n;by=y-n+x;
    }
    if (x+1-y>=1) {
        cx=x+1-y;cy=1;
    } else {
        cx=1;cy=y+1-x;
    }
    if (x-m+y>=1) {
        dx=x-m+y;dy=m;
    } else {
        dx=1;dy=y+x-1;
    }
    solve(ax,ay,1-op);
    solve(bx,by,1-op);
    solve(cx,cy,1-op);
    solve(dx,dy,1-op);
}
int main() {
    scanf("%d%d",&n,&m);
    if (!vis[0][1]) solve(1,1,1);
    if (!vis[0][m]) solve(1,m,1);
    if (!vis[1][1]) solve(n,1,1);
    if (!vis[1][m]) solve(n,m,1);
    for (int i=2;i<m;i++) {
        if (vis[0][i]) continue;
        solve(1,i,1);
    }
    for (int i=2;i<m;i++) {
        if (vis[1][i]) continue;
        solve(n,i,1);
    }
    for (int i=2;i<n;i++) {
        if (vis[2][i]) continue;
        solve(i,1,1);
    }
    for (int i=2;i<n;i++) {
        if (vis[3][i]) continue;
        solve(i,m,1);
    }
    printf("%d\n",cnt);
    for (int i=1;i<=m;i++) {
        if (vis[0][i]==2) printf("%d %d\n",1,i);
    }
    for (int i=1;i<=m;i++) {
        if (vis[1][i]==2) printf("%d %d\n",n,i);
    }
    for (int i=2;i<n;i++) {
        if (vis[2][i]==2) printf("%d %d\n",i,1);
    }
    for (int i=2;i<n;i++) {
        if (vis[3][i]==2) printf("%d %d\n",i,m);
    }
    return 0;
}
/*
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2|a,2!|b:a+b-1
a=b:a+b-2 (1,1)..(1,b-1) (a,1)..(a,b-1)
2!|a,2!|b,a!=b:a+b-1

x.x.x.#.#.
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*/