os.listdir() - choose randomly from the returned list based on a condition

I have a directory containing thousands of images from three different domains

let's say the file names are xxx_A.png and yyy_B.png and zzz_C.png there are thousands from each domain

os.listdir() will return a list for all image names inside the directory

I then want to filter this list based on some percentages

Example: I specify that I want to have out of these thousands of images, only 100 shuffled images where 30% of them will be from domainA, 30% from domainB and 60% of domainC

So simply given a certain number, I have these percentages, and I choose x number of random images (based on the image name for sure, because they are already specified), and this will be the new list

Example:

Input:

['1_A.png', '2_A.png', '3_A.png', '4_A.png', '5_A.png', '6_A.png', '7_A.png', '8_A.png', '9_A.png', '10_A.png', '1_B.png', '2_B.png', '3_B.png', '4_B.png', '5_B.png', '6_B.png', '7_B.png', '8_B.png', '9_B.png', '10_B.png', '1_C.png', '2_C.png', '3_C.png', '4_C.png', '5_C.png', '6_C.png', '7_C.png', '8_C.png', '9_C.png', '10_C.png']

I want 12 images, 30% from domain A, 30% from domain B and 60% from domain C

Output:

 ['1_C.png', '10_C.png', '2_B.png', '4_A.png', '3_A.png', '9_C.png', '7_C.png', '6_A.png', '8_B.png', '10_B.png', '3_C.png', '5_C.png']

How can I make this ?