Why int for integer yet not str for string

Question

I'm not so puzzled as to why int is used for integer, it's shorter that's all. However I don't understand why we don't shorten the string type to str. Eg:

int a = 5
str c = "yeah"

My questions are:

1. What language first used int instead of integer
2. Why don't we use str to shorten the string type

Answer 1

I think the usage of int began with ALGOL68 which then influenced C, which influenced Perl, Python, Javascript, Java and of course C++

In ALGOL60 and Fortran you have to write INTEGER.

str for string, is something I only know from Python