n=list(input().split())

while len(n[0])>0 and n[0]!="@":
   
        print(" "*(int(n[1])-1)+n[0])
        
        for i in range(1,int(n[1])-1):
            print(" "*(int(n[1])-i-1)+n[0]+" "*((i-1)*2+1)+n[0])

        if int(n[1])>1:
            print(n[0]*(int(n[1])*2-1))
        print()
        n=list(input().split())