I'm trying to solve problem "KAMIL" on SPOJ site

The target is to write as small as possible code.

My first solution was:

main=interact$unlines.map(show.(2^).length.filter(`elem`"TDLF")).lines

This code = 70 bytes and it accepted on SPOJ

My second solution was:

main=getLine>>=print.(2^).length.filter(`elem`"TDLF")>>main

This code = 60 bytes, but i get Run-Time error on SPOJ

I don't understand how this code can create RTE?

Please help me

Nadav