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python $$

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program $$

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to $$

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count $$

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charcharacter $$

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freqfrequently $$

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along $$

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with $$

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characharacters $$

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frequency $$

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of $$

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charcharacter $$

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1$1$

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character $$

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freqfrequency $$

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Input $$

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HHOOCHH

Output : H2+$2+$O2+$2+$C+$+$H2$2$H