public class Main{
	public static void main(String[] args) {
		int n=0,m=0;
		for(int i=1;i<=4;i++){
			for(int j=1;j<=13;j++){
				if(n<26){
					System.out.print((char)(97+n));
					n++;
				}else{
					m++;
					System.out.print((char)(97+n-m));
				}
			}
			System.out.println();
		}
	}
}
/**************************************************************
	Problem: 1093
	User: admin
	Language: Java
	Result: Runtime Error
****************************************************************/