#include <bits/stdc++.h>
using namespace std;
bool rdb(double ratio)
{
	int randint=rand();
	if(ratio<1e-10) return false;
	if(ratio>(double)1-(1e-10)) return true;
	double randreal=1.0*randint/RAND_MAX;
	return (randreal<=ratio);
}
int rdi(int x)
{
	int c=0;
	for(int i=1;i<=x;i++)
		c*=10,c+=rand()%10;
	return c+1;
}
double rdf()
{
	return 1.0*rand()/RAND_MAX;
}
int main()
{
	srand(time(0));
	string tc;
	int nn,np,tp;
	while(cin>>tc>>nn>>np>>tp)
	{
		tc+=".in";
		freopen(tc.c_str(),"w",stdout);
		int n=nn-1+rdi(np);
		int m=nn-1+rdi(np);
		cout<<n<<' '<<m<<endl;
		switch(tp)
		{
			case 1:
			{
				for(int i=1;i<=n;i++)
				{
					for(int j=1;j<=m;j++)
						cout<<'R';
					cout<<endl;
				}
				break;
			}
			case 2:
			{
				for(int i=1;i<=n;i++)
				{
					for(int j=1;j<=m;j++)
						cout<<'G';
					cout<<endl;
				}
				break;
			}
			default:
			{
				double ratio=rdf();
				for(int i=2;i<=n;i++)
				{
					for(int j=1;j<=m;j++)
					{
						if(rdb(ratio)) cout<<'R';
						else cout<<'G';
					}
					cout<<endl;
				}
				break;
			}
		}
	}
	return 0;
}