I have read that input alphabet of Turing machine is subset of tape symbols because in input alphabet we don't allow blank symbol. But when ever there is a transition to final state the transition as (Blank,Blank,R/L) (First parameter here is input,second is what machine will write on tape,third is direction).It means whenever we have processed input,we will read Blank and replace Blank by Blank and goto final state.But how can blank be written on the tape if it is not part of input alphabet?
With this knowledge I am trying to answer the following statement
"It is decidable that Turing machine will print some non blank character ".
Because Turing machine will always write something on the tape so it should be decidable. But is it possible that there are only two states and there is only one transition as "(Blank,Blank,R/L)"?