Why is this string considered length one?

2013 5 22
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Why is '15' a string of length one?
>> datestamp = '1991-6-15'
datestamp =
1991-6-15
>> a = textscan(datestamp,'%4s %2s %2s','Delimiter','-');
>> length(a{3})
ans =
1
>> a{3}
ans =
'15'
I'm trying to get the length of the string. Sometimes letters will be used, so converting to numbers is not an option.
Why is '15' a string of length one?

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cypher
cypher 2013-5-22
ANSWER:
a{3} is a cell array of one cell
a{3}{1} is a cell of one string
length( a{3}{1} ) is 2

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cypher
cypher 2013-5-22

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ANSWER:
a{3} is a cell array of one cell
a{3}{1} is a cell of one string
length( a{3}{1} ) is 2

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