#include <stdio.h>

int main(void) {
	int cur = 0;
	for(int i = 9; i > -11; i -= 2){
		int abs_i = i > 0 ? i : -i;
		for(int j = 0; j < abs_i; j++){
			if(j%2 == 0)
				printf("%d", cur+1);
			else
				printf("%c", 'a'+cur);
			cur = (cur + 1) % 9;
		}
		printf("\n");
	}
	
	return 0;
}