Now there is a right triangle composed of * with a side length of . The length of the first row of the triangle is , the length of the second row is , the length of the third row is , and the length of the th row is 1. For example, a right triangle with a side length of 4 is as follows:

****
***
**
*


However, Haitao replaced these * with ordered uppercase letters, A, B, C ... X, Y, Z. That is, the triangle above becomes:


ABCD
EFG
HI
J


When the number of * is greater than 26, the letters used to form the right triangle are not enough, and we start from A again. For example, a right triangle of length 7 is:


ABCDEFG
HIJKLM
NOPQR
STUV
WXY
ZA
B


Now, given the side length of the right triangle, what is the letter of the -th character in the -th row?

Given three positive integers , , and  . It is guaranteed that the right triangle has at least  rows, and the -th row has at least  letters.

Output one letter as the answer.

4 2 3

G

7 7 1

B