#import sys
#n = int(sys.argv[1])
n = int(input())
def print_checkerboard(n):
    for i in range(n):
        for j in range(n+n):
            # Print '*' if the sum of the row and column indices is even, else print a space
            if (i + j) % 2 == 0:
                print('*', end='')
            else:
                print(' ', end='')
        print()  # Move to the next line after printing each row

print_checkerboard(n)