n, c = input().split()
n = int(n)
print('%s'%c * n)
if n % 2 == 0:
for i in range(1, int(n/2 - 1)):
print('%s'%c + ' '* (n - 2) + '%s'%c)
else:
for i in range(1, int(n/2)):
print('%s' % c + ' ' * (n - 2) + '%s' % c)
print('%s'%c * n)