Triangle Pattern of Letters

Given a positive integer \(n\), output a triangle pattern made of uppercase letters. The first row contains 1 letter, the second row contains 2 letters, and so on. The letters are filled in sequentially from \(A\) to \(Z\). After \(Z\) is used, the sequence starts over from \(A\).

inputFormat

The input consists of a single positive integer \(n\) (\(1 \le n \le 10^4\)).

outputFormat

Output the triangle pattern with \(n\) rows. The \(i\)-th row should contain exactly \(i\) uppercase letters. Letters are printed continuously in sequence from \(A\) to \(Z\), with the sequence restarting from \(A\) after \(Z\).

sample

1

A