#include <stdio.h>
int main()
{
int user;
int a = 65;
scanf("%d", &user);
for (int i = 0; i < user; i++)
{
for (int j = 0; j < user; j++)
{
printf("%c ", a + (user - 1 - i)+ (user - 1 - j)* user );
}
printf("\n");
}
return 0;
}
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