Problem Statement

Two deer, AtCoDeer and TopCoDeer, are playing a game called Honest or Dishonest. In this game, an honest player always tells the truth, and an dishonest player always tell lies. You are given two characters $a$ and $b$ as the input. Each of them is either H or D, and carries the following information:

If $a$=H, AtCoDeer is honest; if $a$=D, AtCoDeer is dishonest. If $b$=H, AtCoDeer is saying that TopCoDeer is honest; if $b$=D, AtCoDeer is saying that TopCoDeer is dishonest.

Given this information, determine whether TopCoDeer is honest.

Constraints

• $a$=H or $a$=D.
• $b$=H or $b$=D.

Input

The input is given from Standard Input in the following format:

a b

Output

If TopCoDeer is honest, print H. If he is dishonest, print D.