s=input()
while s!="@":
    s=s.split()
    n=int(s[1])
    if n==1:
        print(" "*(n-1)+s[0])
    else:
        print(" "*(n-1)+s[0])
    
        for i in range(2,n):
            print(" "*(n-i)+s[0]+" "*(2*i-3)+s[0])
        
        print(s[0]*(2*n-1))
    print()
    s=input()