#include <vector>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <algorithm>
#include <numeric>
#include <sstream>
#include <iostream>
#include <iomanip>
#define _USE_MATH_DEFINES
#include <cmath>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <cfloat>
#include <cmath>
#include <ctime>
#include <cstdio>
#include <cassert>
using namespace std;

#define EPS 1e-12
#define ull unsigned long long
#define ll long long
#define VI vector<ll>
#define PII pair<ll, ll> 
#define VVI vector<vector<ll> >
#define REP(i,n) for(int i=0,_n=(n);(i)<(int)_n;++i)
#define RANGE(i,a,b) for(int i=(int)a,_b=(int)(b);(i)<_b;++i)
#define FOR(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();++i)
#define ALL(c) (c).begin(), (c).end()
#define ALLR(c) (c).rbegin(), (c).rend()
#define PB push_back
#define MP(a, b) make_pair(a, b)
#define POPCOUNT __builtin_popcount
#define POPCOUNTLL __builtin_popcountll
#define CLEAR(table, v) memset(table, v, sizeof(table));
#define PRINT1(table, D0) REP(d0, D0) cout<<table[d0]<<" "; cout<<"\n";
#define PRINT2(table, D0, D1) REP(d0, D0) { REP(d1, D1) cout<<table[d0][d1]<<" "; cout<<"\n"; }
#define PRINT3(table, D0, D1, D2) REP(d0, D0) { REP(d1, D1) { REP(d2, D2) cout<<table[d0][d1][d2]<<" "; cout<<"\n"; } cout<<"\n"; }
#define UNIFORM_DOUBLE(a, b) (((b-a)*(double)rand()/RAND_MAX)+a) // [a, b) 
#define UNIFORM_LL(a, b) (ll)UNIFORM_DOUBLE(a, b) // [a, b) 
#define IN(v, lo, hi) ((lo)<=(v) && (v)<(hi))
#define DD(v) cout<<#v<<": "<<v<<endl
template <typename T0, typename T1> std::ostream& operator<<(std::ostream& os, const map<T0, T1>& v) { for( typename map<T0, T1>::const_iterator p = v.begin(); p!=v.end(); p++ ){os << p->first << ": " << p->second << " ";} return os; }
template <typename T0, typename T1> std::ostream& operator<<(std::ostream& os, const pair<T0, T1>& v) { os << v.first << ": " << v.second << " "; return os; }
template <typename T> std::ostream& operator<<(std::ostream& os, const vector<T>& v) { for( int i = 0; i < (int)v.size(); i++ ) { os << v[i] << " "; } return os; }
template <typename T> std::ostream& operator<<(std::ostream& os, const vector<vector<T> >& v) { for( int i = 0; i < (int)v.size(); i++ ) { os << v[i] << endl; } return os; }
template <typename T> std::ostream& operator<<(std::ostream& os, const set<T>& v) { vector<T> tmp(v.begin(), v.end()); os << tmp; return os; }
template <typename T> std::ostream& operator<<(std::ostream& os, const deque<T>& v) { vector<T> tmp(v.begin(), v.end()); os << tmp; return os; }

void solve(ll W, ll H, ll D) {
//	VI dx, dy;
//	RANGE(x, -D, D+1) {
//		ll y = D-abs(x);
//		dx.PB(x);
//		dy.PB(y);
//		if(abs(x)!=D) {
//			dx.PB(x);
//			dy.PB(-y);
//		}
//	}
	vector<string> m(H, string(W, ' '));
	REP(y, H) REP(x, W) m[y][x] = "YRGB"[((x+y)/D%2)*2 + ((x-y+H)/D%2)];
	REP(y, H) cout<<m[y]<<endl;

//	DD(dx);DD(dy);
//	REP(y, H) REP(x, W) {
//		REP(di, dx.size()) {
//			ll nx = x+dx[di];
//			ll ny = y+dy[di];
//			if(IN(nx, 0, W) && IN(ny, 0, H)) {
//				assert(m[y][x]!=m[ny][nx]);
//			}
//		}
//	}
}

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

//	solve(5, 5, 3);
//	return 0;

//	ll N = 30;
//	RANGE(W, 2, N) RANGE(H, 2, N) RANGE(D, 1, H+W-2) {
//		DD(W);DD(H);DD(D);
//		solve(W, H, D);
//	}
//	return 0;

	ll W,H,D;
	while(cin>>H>>W>>D) {
		solve(W,H,D);
	}
	
	return 0;
}


Measured memory_bytes: 768