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t,x=eval(input())
print("\n".join([t[c:c+x].ljust(x)[::1-2*(int(c/x)%2)] for c in range(0,len(t),x)]))

Success #stdin #stdout 0.02s 9936KB

stdin

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"Programming Puzzles & Code Golf", 4

stdout

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Prog
mmar
ing 
zzuP
les 
oC &
de G
 flo

https://ideone.com/6Oxrqj

language:

Python 3 (python 3.9.5)

created:

visibility:

secret

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