Dealing with input and output in Matlab

I just wrote a program which performed some elementary set operations as you can see below. It's the first time I have used input and output of text files so I am mainly looking for critique on that, and also how I use cells.

clear all;
clc;

fileID = fopen('inputseto.txt','r');
data = textscan(fileID,'%s',3,'Delimiter','\n');
data = data{1,1};

n = data{1}
n = str2num(n);

A = data{2};
B = data{3};

A = str2num(A(2:end-1));
B = str2num(B(2:end-1));

output = cell(1,6);

output{1} = union(A,B);
output{2} = intersect(A,B);
output{3} = setdiff(A,B);
output{4} = setdiff(B,A);
output{5} = setdiff(1:n,A);
output{6} = setdiff(1:n,B);

fileID = fopen('outputseto.txt','w');

for i = 1:6
    fprintf(fileID,'{'); 
    fprintf(fileID,'%d, ',output{i}(1:end-1));
    if i ~= 6
        fprintf(fileID,'%d}\n',output{i}(end));
    else
        fprintf(fileID,'%d}',output{i}(end));
    end
end

I got this problem from here. The input is 3 lines, the first lines describes the global set. The first line is an integer n and the global set is the set containing 1,2,...,n. Then the next two lines are two sets A and B. The output consists of various set operations involving A and B. The solution is correct, but I feel like some of this code doesn't "feel right". I am interested in knowing what you think.