Problem:
Score : 300 points

Problem Statement

1000000000000001 dogs suddenly appeared under the roof of Roger's house, all of which he decided to keep. The dogs had been numbered 1 through 1000000000000001, but he gave them new names, as follows:

the dogs numbered 1,2,\cdots,26 were respectively given the names a, b, ..., z;

the dogs numbered 27,28,29,\cdots,701,702 were respectively given the names aa, ab, ac, ..., zy, zz;

the dogs numbered 703,704,705,\cdots,18277,18278 were respectively given the names aaa, aab, aac, ..., zzy, zzz;

the dogs numbered 18279,18280,18281,\cdots,475253,475254 were respectively given the names aaaa, aaab, aaac, ..., zzzy, zzzz;

the dogs numbered 475255,475256,\cdots were respectively given the names aaaaa, aaaab, ...;

and so on.

To sum it up, the dogs numbered 1, 2, \cdots were respectively given the following names:

a, b, ..., z, aa, ab, ..., az, ba, bb, ..., bz, ..., za, zb, ..., zz, aaa, aab, ..., aaz, aba, abb, ..., abz, ..., zzz, aaaa, ...

Now, Roger asks you:

"What is the name for the dog numbered N?"

Constraints

N is an integer.

1 \leq N \leq 1000000000000001

Input

Input is given from Standard Input in the following format:

N

Output

Print the answer to Roger's question as a string consisting of lowercase English letters.

Sample Input 1

2

Sample Output 1

b

Sample Input 2

27

Sample Output 2

aa

Sample Input 3

123456789

Sample Output 3

jjddja

Solution in C++ (Clang 10.0.0) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <string.h>

int main(){
	char a[100];
	long long N, hb, sisa;
	scanf("%lld", &N);
	//printf("%lld\n", N/26);
	int j=0;
	while(1){
		hb=N/26;
		sisa=N%26;
		//printf("hasil bagi: %lld\n", hb);
		//printf("sisa bagi: %lld\n", sisa);
		if(sisa==0){
			a[j]='z';
		}
		if(sisa!=0){
			a[j]=sisa-1+'a';
		}
		j++;
		if(hb==0 || (hb<26 && sisa==0)){
			break;
		}
		N=hb;
	}
	a[j] = '\0';
	int len = strlen(a);
	//printf("%d\n", len);
	for(int i=len-1; i>=0; i--){
		printf("%c", a[i]);
	}
	printf("\n");
	
	return 0;
}