First I also thought that it is four speed automatic but it is actually a CVT. Eco idle also has same transmission. There is no D, S, B in eco idle version too. There is a button on the lever and if I press it S light glows in the meter. It turns off when I again press it again.
Also in normal altos the transmission fluid is written as ATF on dipstick. In this car CVTF is written on the dipstick. CVT is also written in auction sheet as additional sales point. I guess this is some custom model and owner in japan opted to go with CVT.