b=[]
a=list(input().split())
while a[0]!="@":
    b.append(a)
    a=list(input().split())
    '''print(b)'''
for c in b:
    n=int(c[1])
    for i in range(1,n+1):
        if i !=n and i>1:
            print(" "*(n-i),c[0]," "*(2*i-3),c[0],sep="")
        elif i==n:
            print(c[0]*(i*2-1))
        elif i==1:
            print(" "*(n-i),c[0],sep="")       
    print()