eaf ...Where is o

eaf ...Where is o is an esolang by User:Yoyolin0409. It's like a deadfish, but without any commands, not even an 'h' (So where exactly is the "o" in the word "deadfish"?). Of course, it would be a shame if it were truly useless, so I assigned the following functions to the commands e, a, f, "THERE IS NO O":
e must be inserted at the beginning of the program
a increments the temporary register by one. The value of this temporary register ranges from -255 to 256, and it will overflow into a negative number.
f must be inserted at the end of the program
"THERE IS NO O" output the temporary register's value

Example

Output 1

ea"THERE IS NO O"f

Output 100

eaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"THERE IS NO O"f

Output -255

eaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"THERE IS NO O"f