#include<cstdio>
int main()
{
int now=2,n;
scanf("%I64d",&n);
if(n==1)
{
printf("181818181818");
return 0;
}
while(1)
{
now=now*9-8;
if(now>n)
{
printf("181818181818");
break;
}
now=now*2-1;
if(now>n)
{
printf("ZBT");
break;
}
}
}