#include <bits/stdc++.h>
using namespace std;
int main()
{
   for(char a='a';a<='z';a+=2)
   {
    cout<<a<<" ";
   }
   cout<<endl;
   for(char a='z';a>='a';a-=2)
    {
      cout<<a<<" "; 
    }
    return 0;
}

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