HonestOrDishonest

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.

Examples

Input

H H

Output

H

Input

D H

Output

D

Input

D D

Output

H

inputFormat

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

outputFormat

Output

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

Examples

Input

H H

Output

H

Input

D H

Output

D

Input

D D

Output

H

样例

D D

H