#include<iostream>
using namespace std;
char ch[20];
char judge(int temp){
	switch(temp){
		case 1:return 'A';break;
		case 2:return 'B';break;
		case 3:return 'C';break;
		case 4:return 'D';break;
		case 5:return 'E';break;
		case 6:return 'F';break;
		case 7:return 'G';break;
		case 8:return 'H';break;
		case 9:return 'I';break;
		case 10:return 'J';break;
		case 11:return 'K';break;
		case 12:return 'L';break;
		case 13:return 'M';break;
		case 14:return 'N';break;
		case 15:return 'O';break;
		case 16:return 'P';break;
		case 17:return 'Q';break;
		case 18:return 'R';break;
		case 19:return 'S';break;
		case 20:return 'T';break;
		case 21:return 'U';break;
		case 22:return 'V';break;
		case 23:return 'W';break;
		case 24:return 'X';break;
		case 25:return 'Y';break;
		case 0:return 'Z';break;
	}
}
char cc(char ccc){
	if(ccc=='B')return 'A';
	if(ccc=='C')return 'B';
	if(ccc=='D')return 'C';
	if(ccc=='E')return 'D';
	if(ccc=='F')return 'E';
	if(ccc=='G')return 'F';
	if(ccc=='H')return 'G';
	if(ccc=='I')return 'H';
	if(ccc=='J')return 'I';
	if(ccc=='K')return 'J';
	if(ccc=='L')return 'K';
	if(ccc=='M')return 'L';
	if(ccc=='N')return 'M';
	if(ccc=='O')return 'N';
	if(ccc=='P')return 'O';
	if(ccc=='Q')return 'P';
	if(ccc=='R')return 'Q';
	if(ccc=='S')return 'R';
	if(ccc=='T')return 'S';
	if(ccc=='U')return 'T';
	if(ccc=='V')return 'U';
	if(ccc=='W')return 'V';
	if(ccc=='X')return 'W';
	if(ccc=='Y')return 'X';
	if(ccc=='Z')return 'Y';
}
int main(){
	for(int k=1;k<2000;k++){
		long long n;
		int i=0,temp;	
		//cin>>n;
		n=k;
		cout<<k;
		int old,old1=2,old2;		
		while(n){
			temp=n%26;			
			n/=26;				
			if(temp==0){					
				ch[i]='Z';	
			}
			else{
				ch[i]=judge(temp);	
			}				
			i++;
		}		
		for(int j=(i-1);j>=0;j--){				
			cout<<ch[j];	
		}			
		cout<<endl;
	}	
	return 0;
}