a=list(input().split())
while a[0] != '@':
    for i in range(int(a[1])):
        if i == 0:
            print(' '*(int(a[1])-1)+a[0])
        elif i== int(a[1])-1:
            print(a[0]*(2*int(a[1])-1))
        else:
            print(' '*(int(a[1])-i-1)+a[0]+' '*(2*i-1)+a[0])    
    print()
    a=list(input().split())