#include <stdio.h>
int main(){
	int horizontal,vertical;
	char *str = "A";
	scanf("%d%d%c",&horizontal,&vertical,str);
	
	for(int i = 0;i < vertical;i++){
		for(int j = 0;j < horizontal;j++){
			printf("%c",*str);
			if(str = "W"){
				str = "B";
			}else{
				str = "W";
			}
		}
		printf("\n");
	}
	
}