#include <iostream>
using namespace std;
int main (){
	int i;
	char c;
	
	for(i=97;i<=122;i++){
		c=i;
		cout<<c;
		if(i==97+12||i==97+25){
			cout<<endl;
		}
	}
	for(i=122;i>=97;i--){
		c=i;
		cout<<c;
		if(i==122-12||i==97){
			cout<<endl;
		}
	}
}
/**************************************************************
	Problem: 1093
	User: admin
	Language: C++
	Result: Runtime Error
****************************************************************/