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

#define BIT(x) (1ull << (x))
#define FOR(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define RFOR(i, a, b) for (int i = (int)(b) - 1; i >= (int)(a); i--)
#define RREP(i, n) RFOR(i, 0, n)
#define EACH(i, v) for (__typeof((v).begin()) i = (v).begin(); i != (v).end(); ++i)
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
#define UNIQ(v) do {sort(ALL(v)); (v).erase(unique(ALL(v)), (v).end());} while (0)
#define PB push_back
#define MP make_pair
#define SIZE(v) ((int)(v).size())
#define DEBUG(x) cout << #x << " = " << x << endl



int main()
{
	char T[] = {'B', 'W'};
	int w, h;
	char c;
	scanf("%d %d %c", &w, &h, &c);
	int t = c == 'W';
	REP(i, h){
		REP(j, w){
			printf("%c", T[(t + i + j) & 1]);
		}
		puts("");
	}
}