Write function vowels to count the vowels and letters

Write function vowels to count the vowels and letters in free text given as string. Then print out the number of occurrences of each of the vowels a, e, i, o and u in the string, the total number of letters, and each of the vowels as an integer percentage of the letter total.
Suggested output format is:
Numbers of characters:
a 3 ; e 2 ; i 0 ; o 1 ; u 0 ; rest 17
Percentages of total:
a 13%; e 8%; i 0%; o 4%; u 0%; rest 73%

yong ha
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Dec 3rd, 2011
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Lokesh M
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Feb 14th, 2012

I would suggest you make use of string.find() and string.substring() methods, make use of loops and counter variables to achieve the objective.