#include typedef long long ll; #define rep(i, b) for(int i = 0; i < b; i++) #define repi(i, a, b) for(int i = a; i < b; i++) #if defined(_MSC_VER) || __cplusplus > 199711L #define aut(r,v) auto r = (v) #else #define aut(r,v) __typeof(v) r = (v) #endif #define each(it,o) for(aut(it, (o).begin()); it != (o).end(); ++ it) #define MAX_V 1001 #define MAX_E 401 #define MOD 1000000007 #define EPS 1e-5 #define INF INT_MAX #define PI 3.141 inline ll toll(std::string s) { ll v; std::istringstream sin(s); sin >> v; return v; } template inline std::string toString(T x) { std::ostringstream sout; sout << x; return sout.str(); } using namespace std; typedef pair pii; int main() { int W, H; char C[2]; cin >> W >> H >> C[0]; if (C[0] == 'B') { C[1] = 'W'; } else{ C[1] = 'B'; } rep(i, H) { rep(j, W) { if (i % 2 == 1) { cout << C[(1 + j) % 2]; } else{ cout << C[j % 2]; } } cout << endl; } return 0; }