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

typedef long long ll;

ll A,B;

int main(){
	ios_base::sync_with_stdio(false);
	{	
		char ch;
		cin >> A >> ch >> B;
		ll g=__gcd(A,B);
		A/=g;
		B/=g;
	}
	for (ll k=1;k<=1000000/B;k++){
		ll fz=A*k;
		ll fm=B*k;
		ll mn=k*(k+1)/2+(B*k-(k+1))*1;
		ll mx=k*(k+1)/2+(B*k-(k+1))*k;
		
		if (mn<=fz && fz<=mx){
			vector<int> v(k+1,1);
			ll sum=fz-mn;
			ll cnt=fm-(k+1);
			for (;cnt;cnt--){
				if (sum>=k-1){
					v[k]++;
					sum-=k-1;	
				}
				else{
					v[1+sum]++;
					sum=0;
				}
			}
		//	cout << fz << " " << "\n";
			cout << fm << " " << fm-1 << "\n";	
		//	for (int i=0;i<=k;i++) cout << v[i] << " \n"[i==k];	
			ll presum=1;
			for (int i=1;i<=k;i++){
				for (int j=1;j<=v[i];j++){
					cout << presum << " " << presum+j << "\n";	
				}
				presum+=v[i];
			}
			
			return 0;
		}
	}
	cout << "impossible" << "\n";
	return 0;	
}