while True:
    try:
        m=list(map(str,input().split()))
        c=m[0]
        if c=="@":
            break;
        n=int(m[1])
        print(" "*(n-1),c,sep="")
        for i in range(2,n):
            print(" "*(n-i),c," "*(i-1)," "*(i-2),c,sep="")
        if n!=1:
            print(c*(2*n-1))
        print()
    
    except EOFError:
        break