How do you use strcmp for an if statement?

This is what I have in my code, but it keeps giving me and error

mbat = menu('Please select material for bat:','Ash','Hickory','Maple','Pine');
Ashp = input('Please enter selling price of Ash: ');
PrdAtime = input('Enter the following information: [# of bats produced each week, total # of weeks]');
 if PrdAtime(:,2) > 52
     disp('ERROR: Number of weeks too high')
 end
Eqp = input('Are you planning on upgradding Equipment? Enter yes or no: ');
 if strcmpi(Eqp,'yes');
     Fc = input('Please enter fixed cost for upgrade: ');
 end

The Error Says:

Error using input
Undefined function or variable 'yes'.

Answer 1

[Walter Roberson]

Eqp = input('Are you planning on upgradding Equipment? Enter yes or no: ', 's');

[Byron Flores]

It worked, Thank you so much