n=int(input())
r=2*n-1
c=2*r-1
mid=(c+1)//2
x=mid
y=mid
for i in range(1,r+1):
    for j in range(1,c+1):
        if((j>=x and j<=y) and j&1):
            if(j<=mid):
                print(chr(96+n-((j-x)//2)),end="")
            else:
                print(chr(96+n-((y-j)//2)),end="")
        else:    
            print("-",end='')
    if(i<n):
        x-=2
        y+=2
    else:
        x+=2
        y-=2
    print()