#include <string.h>

int main(){
	char d[16384];
	memset(d,127,16384);
	int mx,my,i=128,p=0,mp[4]={1,128,-1,-128},total,now=-1;
	scanf("%d %d",&mx,&my);
	for(int i=1;i<mx+1;++i) memset(d+128*i+1,0,my);
	total=mx*my;
	while(total--){
		now=(now+1)%26;
		d[i+=mp[p]]=now+'A';
		if(d[i+mp[p]]) p=(p+1)&3;
	}
	for (int y=1;y<=mx;y++) {
		for (int x=1;x<=my;x++)
			printf("   %c",d[x+(y<<7)]);
		printf("\n");
	}
}