#include<bits/stdc++.h>
using namespace std;
long long n;
string k="",h="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int main()
{
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	cin>>n;
	for(long long i=n;i>0;i=i/27)
    {
        k=h[i%27]+k;
    }
	cout<<k;
	return 0;
}

就是卡在27，26这两个边界过不去，求大佬指导