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Looks very simple. Personally, I would have looped through each line of the text file, check each line if it is a integer or character. If it is was an integer, add it to a $sum variable. If it was a character, then place that in an array like this:

$char[$currentLineValue] = $currentLineValue;

Then to display the results, echoed out the $sum and then:

foreach($char as $character) {
// echo out variables here