Concatenate material number with a standard value

Hi all

Each time I get the material number as input in my program and I have to Concatenate material number with a standard value.

.

Say for if my material number is 49 I have to make it as AB_DEF_49.

Similarly if my material number is 8967345 I have to make it AB_DEF_8967345.

Each time I have to attach AB_DEF_ for my material number and use it in my program.

Can some one tell me how can I attach AB_DEF_ for my input that is material number and make it as

AB_DEF_material.

Regards,

Jessica sam