[R] ggplot2 font size problem

[dhzdhz]

How do I change the font size of the label in ggplot. For example

x=c("abcdefghijklmn", "opqrstuvwxyz")
y=c(1, 2)
df=data.frame(name=x, value=y)

p=ggplot(df, aes(name, y))+geom_point()

Now the name of "abcdefghijklmn" and "opqrstuvwxyz" are too long. How can I
change the font size of them. And can I also change the orientation of them?

thanks
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