#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for(ll i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (ll)(x).size()
#define F first
#define S second
#define pb push_back
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;

int main() {
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(cin.failbit);
	ll a,b;cin>>a>>b;
	ll c = a%b;
	if(c==0){
		cout<<-1<<endl;
		return 0;
	}
	if(__gcd(a,b)==1){
		cout<<1<<'\n'<<a<<endl;
		return 0;
	}
	bool theflag=false;
	if(b%2==0 && c%2==1){
		theflag=true;
		c-=1;
	}
	rep(i,1,b/2+1){
		if(__gcd(i,b)!=1)continue;
		ll otr = (10*b+c-i)%b;
		if(__gcd(otr,b)!=1) continue;
		if(theflag){
			ll t = 1+i+otr;
			otr+=a-t;
			cout<<3<<'\n'<<otr<<' '<<i<<' '<<1<<endl;
		}else{
			ll t = i+otr;
			otr+=a-t;
			cout<<2<<'\n'<<otr<<' '<<i<<endl;
		}
		break;
	}
}