Eligible Words

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Chef has a bag full of words. Each word contains some lowercase and uppercase letters. Chef wants to find the $number$ $of$ $words$ $that$ $are$ $eligible$ $to$ $form$ $a$ $paragraph$. Eligible words are where $each$ $alphabet$ $in$ $the$ $word$ $is$ $present$ $atleast$ $once$ $in$ $it's$ $uppercase$ $as$ $well$ $as$ $lowercase$. Help Chef find the $number$ $of$ $eligible$ $words$.

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solution.cppC++17

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