EOJ-自适应编程学习平台

Count the occurrences of different words in several lines, and output in alphabetical order.

Words can be separated with at least one of the \n, \t, (space).

Lowercase ascii letters only. Sum length of all words will not exceed $500~000$.

aaa bbb ccc
ddd aaa bbb eee aaa

aaa 3
bbb 2
ccc 1
ddd 1
eee 1