clc;
disp('exercise Comparing two sequences');
str1=input('enter DNA sequence str1');
str2=input('enter DNA sequence str2');
   
if length(str1)~=length(str2)
    disp(['not equal']);
    return;
end

len=length(str1);

for i=1:len
    x=str1(i);
    y=str2(i);
    if x~=y
        disp(['not equal']);
        return;
    end
end   
   
  disp(['equal']);