Maki help

[fille1000]

I have two strings, one that gets the title of the currently playing song and one with the tracknumber.
I want to put those two together into a third string.
for example:
string1 = 4
string2 = Run to the Hills

string3 = 4. Run to the Hills


How do i code this in maki?

[E-Trance]

string3 = string1+". "+string2;