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  1. s=input();r=s[::-1];n=len(s)-1;i=0;S=''
  2. while i<=n:S+=s[i:]+s[:n-i]+r[i+2:]+r[:n-i];i+=2
  3. print S
Success #stdin #stdout 0s 9032KB
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"cena!"
stdout
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cena!cenanec!anena!cec!a!
https://ideone.com/8w6MIg
language:
Python (cpython 2.7.16)
created:
7 years ago
visibility:
secret

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