Family Problems

5297. Family Problems Problem code: FAMILYP

#include<stdio.h>
#include<math.h>
int main()
{
    long long int N;
    int ans;
    float n;
    char c;
       
       while((scanf("%lld",&N)) !=EOF)
       {
            n=-1+sqrt(1+8*N);
            n=n/2;
       
            long k;
            k=ceil(n);
          ans=k%27-1;
          printf("TERM %lld IS %c\n",N,65+ans);
         
        }
        return 0;
}