a=input("Enter a string:")
length = len(a)
step = length // 2
for i in range (step) :
    for j in range (length) :
        if j < step :
            if i == j :
                print (a [ j ], end ="")
            else :
                print ( " " , end = "")
        else :
            if j == length -i -1 :
                print (a [ j ], end = "")
            else :
                print (" ", end = "")
    print ()
if length % 2 == 1 :
    for i in range (step):
        print (" ", end = "")