How to save a txt file in matlab with the specified name I want?

Example:

filename = input('Enter the file name: ','s')
A
save(fullfile('directory path','filename.txt'),'A','-ascii')

Answer 1

[Walter Roberson]

fullname = fullfile('directory path', [filename '.txt']);
save(fullname, 'A', '-ascii')

[Luccas S.]

Thanks