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Hello"
I am new to this but may be i can help.first go to image then image size & in dilog box enter 36" make sure it is in inches when you enter 36 photoshop give you other dimension if it is...

one way is you type them on seprate layers.The other is you press Ctrl & click on the layer and then take any selection tool and press
Alt and deselect those letters you don't need
Have fun