# your code goes here


a=function(){
	paste0(sample(letters,sample(5:15)),sep="",collapse="")
   }

input=replicate(10,a())



combs=do.call(paste0,expand.grid(letters,letters))

t(sapply(input,function(x)
                       table(
                       factor(substring( x, first=1:(nchar(x)-1), last=2:nchar(x)
                              ),levels=combs) )))