How to find the number of letters in the image?

how do I find out how many letters are in the image below and print them on the image?

[Walter Roberson]

I know the three dots is the Morse Code for the letter 'S', but in Braille it would be '31' which is a different number of characters, so I don't think thise question has an actual answer.

Answer 1

[yanqi liu]

clc; clear all; close all;
img = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/855210/image.png');
figure; imshow(img);

bw = im2bw(img);
bw = imclose(bw, strel('line', 3, 90));
bw = bwareaopen(bw, 17);
[~,num] = bwlabel(bw);
img2 = insertText(img, [3 size(img,1)*0.8], sprintf('find %d letters',num),'FontSize',18,'BoxColor',...
    'r','BoxOpacity',0.8,'TextColor','white');
figure; imshow(img2);