In a series of characters which looks like this:
r, t, h, j, m, ...
Find out what character comes next.
As the word "character" is used instead of "letter", the series could be:
r, t, h, j, m, comma
because this is almost "right and diagonal down and repeat" on a standard QWERTY keyboard.
If this is the intended method, a more consistent series would have been t, y, h, j, m, comma
You can get r,t,h,j,m,o,r,t,h,j,m,o by doing the following formula and converting the number to the correct position in the alphabet: