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<!DOCTYPE html>
<html>
<head>
<title>Challenge 78</title>
</head>
<body>
</body>
</html>
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css
css
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js
js
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var a = prompt("Enter a string:", "aaaabbccccddee");
var b = 0, c = [a.charAt(0)];
for (var d = 1; d < a.length; d++)
if (a.charAt(d) === a.charAt(d - 1))
c[b] += a.charAt(d);
else
c[++b] = a.charAt(d);
var e = "";
for (var f = 0; f < c.length; f++)
e += c[f].length + c[f].charAt(0);
alert(a + " => " + e);
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