#include <bits/stdc++.h>
using namespace std;
typedef long long ll; 
int tot = 0, ans[1010][2];
void solve(ll x, ll y, ll z, int a, int b, int c){
	if(x > y){ solve(y, x, z, b, a, c); return; }
	if(y > z){ solve(x, z, y, a, c, b); return; }
	if(x == 0) return;
	ll i, j = (y + (x >> 1)) / x;
	for(i = 0; 1ll << i <= j; i++){
		if(x > y) swap(x, y), swap(a, b);
		if(j >> i & 1){
			tot++; ans[tot][0] = b; ans[tot][1] = a;
			y -= x; x <<= 1;
		}else{
			tot++; ans[tot][0] = c; ans[tot][1] = a;
			z -= x; x <<= 1;
		}
	}
	solve(x, y, z, a, b, c);
}
int main()
{
	int x, y, z, i;
	scanf("%d%d%d", &x, &y, &z);
	solve(x, y, z, 1, 2, 3);
	printf("%d\n", tot);
	for(i = 1; i <= tot; i++) printf("%d %d\n", ans[i][0], ans[i][1]);
	return 0;
}