string to array and then getting the first value of the array

I am trying to write a code that has a user input a string (in this case Yes).
This string then needs to be convereted to an array so that I can get the first value of said array. (i.e the Y.)
This is what I have so far.
solid = input('Is it a solid color?:' , 's');
If someone can point me in the right direction it would be greatly appriciated.

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