Last character

Hi,

I would like to ask how to identify the suffix for a particular field.

Suppose I have one field value MANGO. Now I would like to set the last character of a field i.e. I wanted to see

the output like O only. But remember the field lengths are different.

i,e,

Field

MANGO

APPLE

BANANA

so I wanted to see output like O, E, A.

Anybody will pls help me.