x = input('Enter the string : ')
for i in range(len(x)//2):
for k in range(i):
print(' ',end='')
print(x[i] ,end='')
for j in range(len(x)//2+2-i):
print(' ',end='')
print(x[-i-1])
if len(x)%2:
for m in range(len(x)//2 + 1):
print(' ',end='')
print(x[len(x)//2])