Matrix dimension problem when asking 'What is your name?'

Here is my matlab code. It only works when the input name is 4 characters long otherwise it gives me matrix dimension error. How to make this work for names of all length

prompt = 'What is your name?'
N = input(prompt,'s');
if N=='Jack'
    disp('Jack is great!');
else
    disp('Hello');
end

Answer 1

[Azzi Abdelmalek]

Use isequal instead of ==

prompt = 'What is your name?'
N = input(prompt,'s');
if  isequal(N,'Jack')
  disp('Jack is great!');
else
  disp('Hello');
end

Answer 2

[Azzi Abdelmalek]

Use isequal

prompt = 'What is your name?'
N = input(prompt,'s');
if  isequal(N,'Jack')
  disp('Jack is great!');
else
  disp('Hello');
end