related to smartforms

I have a variable declared in the print program it contains data of 40 chars(the size is 40)I have to import that into the smartform, the challengeI am having in getting the data INTO THE FORM THROUGH THE VARIABLE because I am not able to declare the variable(form) with the equiavlent datatype (that holds 40 chars).

Is there any datatype that I can declare in the form for the variable that it can read this big data?