Write $$

$$

python $$

$$

program $$

$$

to $$

$$

count $$

$$

charcharacter $$

$$

freqfrequently $$

$$

along $$

$$

with $$

$$

characharacters $$

$.$

$$If $$frequency $$of $$charcharacter $$is $$

$1$

$,$

$$Then only shows character without freqfrequency $.$

$$

Input $$

$$

: $$

$$

HHCOO

Output : H$2$CO$2$