while 1:
    s = input().split()
    c = s[0]
    if c == '@': break
    n = eval(s[1])
    for i in range(1, n+1):
        if i == 1:
            for j in range(1, n): print(' ', end = '')
            print(c)
        elif i == n:
            for j in range(1, 2*n): print(c, end = '')
            print('')
        else:
            for j in range(1, n-i+1): print(' ', end = '')
            print(c, end = '')
            for j in range(1, (i-1)*2): print(' ', end = '')
            print(c)
    print('')