//nested for loops

#include<stdio.h>

int main(void)
{
	const int ROWS = 26;
	const int COLS = 26;

	int row;
	char ch;

	for(row=0;row<ROWS;row++)
	{
		for(ch=('A'+ row); ch <('A' + COLS);ch++)
			printf("%c",ch);
		printf("\n");
	}

	return 0;
}